[RFC]: Deprecate `max_num_generation_tokens`

[vincent-4]

Motivation.

Said by @robertgshaw2-redhat #14055 (comment)

Proposed Change.

As part of v1, we should deprecate max_num_generation_tokens.

Feedback Period.

When agreed if this change should be made.

CC List.

@robertgshaw2-redhat @markmc

Any Other Things.

I will do this if interested.

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