Iterator norm in isapprox for Arrays

[jishnub]

This seems to improve performance, and reduces allocations:

julia> A = rand(100,100);

julia> @btime isapprox($A, $A);
  13.305 μs (3 allocations: 78.21 KiB) # master
  8.063 μs (0 allocations: 0 bytes) # this PR

julia> A = rand(5000,5000);

julia> @btime isapprox($A, $A);
  106.003 ms (3 allocations: 190.74 MiB) # master
  43.122 ms (0 allocations: 0 bytes) # this PR

Currently, this is only specialized for Arrays, but this may be extended to StridedArrays after JuliaLang/julia#58635. In the future, the new function may be specialized for structured matrix types to only iterate over filled bands.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.81%. Comparing base (0116878) to head (35c5dd3).
Report is 9 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1378   +/-   ##
=======================================
  Coverage   93.81%   93.81%           
=======================================
  Files          34       34           
  Lines       15717    15722    +5     
=======================================
+ Hits        14745    14750    +5     
  Misses        972      972           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.