Adding cls reference to TypedDictSchema

[sydney-runkle]

This follows the pattern we use for models and dataclasses, so we might as well be consistent here and remove the coupling from metadata.

[codspeed-hq]

CodSpeed Performance Report

Merging #1410 will not alter performance

_{Comparing typed-dict-to-schema (45aad17) with main (de04f03)}

Summary

✅ 155 untouched benchmarks

[adriangb]

Good idea