add build_info to _pydantic_core

[samuelcolvin]

Useful to check if PGO was used. We should add this to pydantic.version.version_info().

Selected Reviewer: @davidhewitt

[samuelcolvin]

please review.

[codspeed-hq]

CodSpeed Performance Report

Merging #749 will not alter performances

_{Comparing pgo-build-info (0516bf1) with main (fac2a40)}

Summary

✅ 126 untouched benchmarks

[adriangb]

Looks good! I assume you tested the actual contents locally and they look good?

[samuelcolvin]

Looks good! I assume you tested the actual contents locally and they look good?

It should say 'release pgo mimalloc' in production with PGO. I'll add the negative cases like no-pgo and std-allocator.

[codecov]

Codecov Report

Merging #749 (4709c78) into main (fac2a40) will decrease coverage by 0.01%.
The diff coverage is 80.00%.

❗ Current head 4709c78 differs from pull request most recent head 0516bf1. Consider uploading reports for the commit 0516bf1 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #749      +/-   ##
==========================================
- Coverage   93.64%   93.63%   -0.01%     
==========================================
  Files          99       99              
  Lines       13929    13939      +10     
  Branches       25       25              
==========================================
+ Hits        13044    13052       +8     
- Misses        879      881       +2     
  Partials        6        6              

Impacted Files	Coverage Δ
src/lib.rs	95.55% <80.00%> (-4.45%)	⬇️

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[davidhewitt]

Looks like helpful metadata for us to know when debugging odd errors if we add to version info as you suggest, and also for users to verify if they're getting the "most optimized" build.