[Feat][whisper] add more sampling parameters to whisper endpoint

[joennlae]

This PR adds the following sampling parameters to the whisper endpoint:

seed, frequency_penalty, repetition_penalty, presence_penalty

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[joennlae]

Added documentation and updated the example

[NickLucche]

Streaming PR landed, would you mind rebasing your work on current main?

[JakubCerven]

any estimate when this might land?

[joennlae]

I am currently not working on that. As the key feature for us would be beam search implementation. Which is currently in a heavy limbo state due to the migration to V1. Once V1 is a bit more set in stone, I will probably reconsider vllm with a "quick" beam search implementation. So feel free to rebase this again.

[NickLucche]

I will rebase this if that's ok with you @joennlae . This might actually be already useful for benchmarking parameters. Thanks for your contribution!

[mergify[bot]]

This pull request has merge conflicts that must be resolved before it can be merged. Please rebase the PR, @joennlae.

https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/working-with-forks/syncing-a-fork