Introduce Equal comparison in pcommon types

[dmathieu]

Description

This introduces .Equal() methods to most pcommon types, so equality comparison can be performed with no allocations.

The types Equal is added to are:

• Value
• ByteSlice
• Float64Slice
• Int32Slice
• Int64Slice
• StringSlice
• Uint64Slice
• Map
• Slice

The original intent was to add it to Value. However, to be able to handle every type in there, I had to also add it to the other types, some of which are coming too because they are auto-generated.

Link to tracking issue

Fixes #12561

This is the same thing as #12568, but with comparison of pcommon types rather than raw ones.

Testing

Here are the results from the new benchmarks.

goos: darwin
goarch: arm64
pkg: go.opentelemetry.io/collector/pdata/pcommon
cpu: Apple M1 Max
BenchmarkByteSliceEqual-10              513754251                2.181 ns/op           0 B/op          0 allocs/op
BenchmarkFloat64SliceEqual-10           550760200                2.189 ns/op           0 B/op          0 allocs/op
BenchmarkInt32SliceEqual-10             550836993                2.186 ns/op           0 B/op          0 allocs/op
BenchmarkInt64SliceEqual-10             536615931                2.178 ns/op           0 B/op          0 allocs/op
BenchmarkStringSliceEqual-10            166586130                7.055 ns/op           0 B/op          0 allocs/op
BenchmarkUInt64SliceEqual-10            550221884                2.191 ns/op           0 B/op          0 allocs/op
BenchmarkMapEqual-10                    100000000               10.29 ns/op            0 B/op          0 allocs/op
BenchmarkSliceEqual-10                  165937951                7.185 ns/op           0 B/op          0 allocs/op
BenchmarkValueEqual/nil-10              425391500                2.817 ns/op           0 B/op          0 allocs/op
BenchmarkValueEqual/strings-10          226853427                5.441 ns/op           0 B/op          0 allocs/op
BenchmarkValueEqual/booleans-10         296628630                4.080 ns/op           0 B/op          0 allocs/op
BenchmarkValueEqual/ints-10             296841543                4.070 ns/op           0 B/op          0 allocs/op
BenchmarkValueEqual/doubles-10          296242837                4.050 ns/op           0 B/op          0 allocs/op
BenchmarkValueEqual/byte_slices-10              173515455                6.855 ns/op           0 B/op          0 allocs/op
BenchmarkValueEqual/slices-10                   83512392                14.10 ns/op            0 B/op          0 allocs/op
BenchmarkValueEqual/maps-10                     63556654                18.41 ns/op            0 B/op          0 allocs/op
PASS
ok      go.opentelemetry.io/collector/pdata/pcommon     24.650s

[codecov]

Codecov Report

Attention: Patch coverage is 93.33333% with 4 lines in your changes missing coverage. Please review.

Project coverage is 92.09%. Comparing base (983cc46) to head (589d916).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
pdata/pcommon/map.go	82.35%	2 Missing and 1 partial ⚠️
pdata/pcommon/value.go	95.45%	1 Missing ⚠️

❌ Your patch status has failed because the patch coverage (93.33%) is below the target coverage (95.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #12594   +/-   ##
=======================================
  Coverage   92.09%   92.09%           
=======================================
  Files         473      473           
  Lines       25590    25650   +60     
=======================================
+ Hits        23567    23623   +56     
- Misses       1612     1615    +3     
- Partials      411      412    +1     

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