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[ty] synthesize __setattr__ for frozen dataclasses (#19307)
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## Summary

Synthesize a `__setattr__` method with a return type of `Never` for
frozen dataclasses.

https://docs.python.org/3/library/dataclasses.html#frozen-instances

https://docs.python.org/3/library/dataclasses.html#dataclasses.FrozenInstanceError

### Related
https://github.com/astral-sh/ty/issues/111
https://github.com/astral-sh/ruff/pull/17974#discussion_r2108527106
https://github.com/astral-sh/ruff/pull/18347#discussion_r2128174665

## Test Plan

New Markdown tests

---------

Co-authored-by: David Peter <mail@david-peter.de>
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justin 2025-07-18 05:35:05 -04:00 • committed by GitHub
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crates/ty_python_semantic/resources/mdtest/attributes.md
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@ -1806,7 +1806,7 @@ class Frozen:
raise AttributeError("Attributes can not be modified")
instance = Frozen()
instance.non_existing = 2 # error: [invalid-assignment] "Cannot assign to attribute `non_existing` on type `Frozen` whose `__setattr__` method returns `Never`/`NoReturn`"
instance.non_existing = 2 # error: [invalid-assignment] "Can not assign to unresolved attribute `non_existing` on type `Frozen`"
instance.existing = 2 # error: [invalid-assignment] "Cannot assign to attribute `existing` on type `Frozen` whose `__setattr__` method returns `Never`/`NoReturn`"
```