refactor: update to SymbolicUtils@4 and Symbolics@7

[AayushSabharwal]

Checklist

• Appropriate tests were added
• Any code changes were done in a way that does not break public API
• All documentation related to code changes were updated
• The new code follows the
  contributor guidelines, in particular the SciML Style Guide and
  COLPRAC.
• Any new documentation only uses public API

Additional context

Add any other context about the problem here.

[github-actions]

Remaining comments which cannot be posted as a review comment to avoid GitHub Rate Limit

JuliaFormatter

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ModelingToolkit.jl/src/systems/connectors.jl

Line 1118 in bf11961

SymbolicUtils.promote_symtype(::typeof(instream_rt), ::Type{T}, ::Type{S}, ::Type{R}) where {T, S, R} = Real

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ModelingToolkit.jl/src/systems/imperative_affect.jl

Line 73 in bf11961

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ModelingToolkit.jl/src/systems/index_cache.jl

Line 32 in bf11961

const MaybeArrayIndexT = Union{Int, UnitRange{Int}, Base.ReshapedArray{Int, N, UnitRange{Int}} where {N}}

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ModelingToolkit.jl/src/systems/index_cache.jl

Lines 114 to 115 in bf11961

	parse_callbacks_for_discretes!(cevs, disc_param_callbacks, constant_buffers, nonnumeric_buffers, 0)
	parse_callbacks_for_discretes!(devs, disc_param_callbacks, constant_buffers, nonnumeric_buffers, length(cevs))

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ModelingToolkit.jl/src/systems/index_cache.jl

Line 130 in bf11961

push!(disc_syms_by_symtype_by_partition[i], filter(==(partition) ∘ Base.Fix1(getindex, disc_param_callbacks), buffer))

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ModelingToolkit.jl/src/systems/index_cache.jl

Line 163 in bf11961

push!(disc_buffer_templates, map(Base.Fix1(BufferTemplate, symtype) ∘ length, disc_syms_by_partition))

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ModelingToolkit.jl/src/systems/index_cache.jl

Lines 298 to 301 in bf11961

	BSImpl.Term(; f, args) => begin
	f === getindex && (idx = get(disc_idxs, args[1], nothing)) !== nothing
	end
	_ => false

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ModelingToolkit.jl/src/systems/index_cache.jl

Line 370 in bf11961

function parse_callbacks_for_discretes!(events::Vector, disc_param_callbacks::Dict{SymbolicT, BitSet}, constant_buffers::Dict{TypeT, Set{SymbolicT}}, nonnumeric_buffers::Dict{TypeT, Set{SymbolicT}}, offset::Int)

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ModelingToolkit.jl/src/systems/index_cache.jl

Line 445 in bf11961

function SymbolicIndexingInterface.parameter_index(ic::IndexCache, sym::Union{Num, Symbolics.Arr, Symbolics.CallAndWrap})

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ModelingToolkit.jl/src/systems/index_cache.jl

Line 501 in bf11961

function check_index_map(idxmap::Dict{SymbolicT, V}, sym::SymbolicT)::Union{V, Nothing} where {V}

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ModelingToolkit.jl/src/systems/nonlinear/initializesystem.jl

Line 829 in bf11961

mask[i] = !iscall(eq.rhs) || operation(eq.rhs) !== StructuralTransformations.change_origin

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ModelingToolkit.jl/src/systems/system.jl

Line 282 in bf11961

if (checks isa Bool && checks === true || checks isa Int && (checks & CheckComponents) > 0) && iv !== nothing

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ModelingToolkit.jl/src/systems/system.jl

Line 448 in bf11961

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ModelingToolkit.jl/src/systems/systemstructure.jl

Line 755 in bf11961

fullvars[i], discmap; filterer = Symbolics.FPSubFilterer{Union{Sample, Hold, Pre}}()))

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ModelingToolkit.jl/src/utils.jl

Line 36 in bf11961

issym(op) && return SSym(nameof(op); type = FnType{Tuple{symtype(iv)}, Real}, shape = SU.ShapeVecT())(iv)

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ModelingToolkit.jl/src/utils.jl

Line 193 in bf11961

BSImpl.Term(; f) && if f isa Differential end => begin

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ModelingToolkit.jl/src/utils.jl

Line 288 in bf11961

function process_variables!(var_to_name::Dict{Symbol, SymbolicT}, defs::SymmapT, guesses::SymmapT, vars::Vector{SymbolicT})

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ModelingToolkit.jl/src/utils.jl

Line 328 in bf11961

BSImpl.Term(; f, args) && if f === getindex end => args[1]

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ModelingToolkit.jl/src/utils.jl

Line 399 in bf11961

hasmetadata(x, VariableSource) || iscall(x) && operation(x) === getindex && isvariable(arguments(x)[1])::Bool

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ModelingToolkit.jl/src/utils.jl

Line 543 in bf11961

function collect_scoped_vars!(unknowns::OrderedSet{SymbolicT}, parameters::OrderedSet{SymbolicT}, sys::AbstractSystem, iv::Union{SymbolicT, Nothing}; depth = 1, op = Differential)

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ModelingToolkit.jl/src/utils.jl

Line 626 in bf11961

BSImpl.Term(; f) && if f isa O end => true

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ModelingToolkit.jl/src/utils.jl

Line 635 in bf11961

BSImpl.Term(; f) && if f isa Operator end => f isa O

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ModelingToolkit.jl/src/utils.jl

Line 654 in bf11961

function collect_vars!(unknowns::OrderedSet{SymbolicT}, parameters::OrderedSet{SymbolicT}, expr::SymbolicT, iv::Union{SymbolicT, Nothing}; depth = 0, op = Symbolics.Operator)

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ModelingToolkit.jl/src/utils.jl

Line 672 in bf11961

function collect_vars!(unknowns::OrderedSet{SymbolicT}, parameters::OrderedSet{SymbolicT}, expr::AbstractArray{SymbolicT}, iv::Union{SymbolicT, Nothing}; depth = 0, op = Symbolics.Operator)

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ModelingToolkit.jl/src/utils.jl

Line 724 in bf11961

check_scope_depth(getmetadata(var, SymScope, LocalScope())::AllScopes, depth) || return nothing

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ModelingToolkit.jl/src/variables.jl

Line 198 in bf11961

iscall(x) && operation(x) === getindex && return safe_getmetadata(m, arguments(x)[1], default)

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ModelingToolkit.jl/src/variables.jl

Line 259 in bf11961

BSImpl.Term(; f, args, shape, type, metadata) && if f isa Operator end => begin

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ModelingToolkit.jl/src/variables.jl

Line 621 in bf11961

getunshifted(x::SymbolicT) = Symbolics.getmetadata(x, VariableUnshifted, nothing)::Union{SymbolicT, Nothing}