use __new__ in .pyi for Rust types

[davidhewitt]

Change Summary

Follow up promised from #702 (comment)

The motivation is that the PyO3 types actually define __new__, not __init__, so that's what we should document in the .pyi. I checked with mypy and vscode and the type inference of the constructor seems to work just as well with __new__.

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

[davidhewitt]

please review

[codecov]

Codecov Report

Merging #743 (6198b37) into main (d08d269) will not change coverage.
The diff coverage is n/a.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #743   +/-   ##
=======================================
  Coverage   93.63%   93.63%           
=======================================
  Files          99       99           
  Lines       13895    13895           
  Branches       25       25           
=======================================
  Hits        13010    13010           
  Misses        879      879           
  Partials        6        6           

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[codspeed-hq]

CodSpeed Performance Report

Merging #743 will not alter performances

_{Comparing dh/pyi-new (6198b37) with main (d08d269)}

Summary

✅ 126 untouched benchmarks