Support limit thinking len for text models.

[K11OntheBoat]

Limit the length of a model's reasoning.
For example, if a request with "enable_thinking": true and reasoning_max_tokens": 20 is sent, the model will be limited to a reasoning length of 20, and will then immediately begin responding.

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1 out of 2 committers have signed the CLA.

✅ luukunn
❌ K11OntheBoat

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