Move deque schema gen to GenerateSchema class

[sydney-runkle]

Follow up to #10846

See the description of that PR for more detail.

One consequence here is slightly different behavior for maxlen being set for deque types, but I think this is worth the significant simplification in internal logic we see here.

max_length constraints are still enforced, but we no longer monkeypatch the maxlen from max_length on the deque. If users want this, they should write a custom validator.

I'll be writing an in depth explanation of changes in the changelog for v2.11 related to this PR sequence.

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CodSpeed Performance Report

Merging #11239 will not alter performance

_{Comparing remove-deq-prep-anns (34193ea) with main (8fc509d)}

Summary

✅ 46 untouched benchmarks

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File	Statements	Missing	Coverage	Coverage (new stmts)	Lines missing
pydantic/_internal
_generate_schema.py
_validators.py
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[sydney-runkle]

cc @adriangb, more progress on simplifying logic here :)

No need for a review, but wanted to let you know.

[Viicos]

Great

The fact that we can't access the metadata anymore to set the maxlen attribute shows a limitation of the current API, I'll maybe include it in my write up

[sydney-runkle]

The fact that we can't access the metadata anymore to set the maxlen attribute shows a limitation of the current API, I'll maybe include it in my write up.

I'm not opposed to allowing metadata access, though this opens a can of worms in terms of consistency with annotation application.