allow function-wrap-schema to reuse parent schema

[samuelcolvin]

avoid issues with cyclic references, and also with building unnecessarily big schemas.

[codecov-commenter]

Codecov Report

Merging #515 (203557b) into main (cd5cd65) will increase coverage by 0.03%.
The diff coverage is 96.96%.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #515      +/-   ##
==========================================
+ Coverage   94.77%   94.80%   +0.03%     
==========================================
  Files          93       93              
  Lines       12262    12259       -3     
  Branches       25       25              
==========================================
+ Hits        11621    11622       +1     
+ Misses        634      630       -4     
  Partials        7        7              

Impacted Files	Coverage Δ
src/validators/function.rs	96.05% <ø> (+0.20%)	⬆️
src/build_tools.rs	86.52% <90.00%> (+0.26%)	⬆️
pydantic_core/core_schema.py	96.74% <100.00%> (ø)
src/serializers/shared.rs	90.38% <100.00%> (ø)
src/serializers/type_serializers/function.rs	92.04% <100.00%> (+0.23%)	⬆️

... and 2 files with indirect coverage changes

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[codspeed-hq]

CodSpeed Performance Report

Merging #515 function-wrap-schema (203557b) will not alter performances.

Summary

🔥 0 improvements
❌ 0 regressions
✅ 95 untouched benchmarks

🆕 0 new benchmarks
⁉️ 0 dropped benchmarks