add profiling make target and instructions

[davidhewitt]

Change Summary

Based on my experience of profiling #763.

Related issue number

N/A

Checklist

• Unit tests for the changes exist
• Documentation reflects the changes where applicable
• Pydantic tests pass with this pydantic-core (except for expected changes)
• My PR is ready to review, please add a comment including the phrase "please review" to assign reviewers

Selected Reviewer: @adriangb

[codecov]

Codecov Report

Merging #793 (14e71a9) into main (9b540d0) will increase coverage by 0.00%.
The diff coverage is 100.00%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #793   +/-   ##
=======================================
  Coverage   93.53%   93.53%           
=======================================
  Files         100      100           
  Lines       14376    14378    +2     
  Branches       25       25           
=======================================
+ Hits        13446    13448    +2     
  Misses        924      924           
  Partials        6        6           

Impacted Files	Coverage Δ
src/input/input_python.rs	98.11% <100.00%> (+0.01%)	⬆️
src/validators/function.rs	90.65% <100.00%> (ø)

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[codspeed-hq]

CodSpeed Performance Report

Merging #793 will not alter performance

_{Comparing dh/profiling (14e71a9) with main (f38bea6)}

Summary

✅ 126 untouched benchmarks

[davidhewitt]

please review