Update to pass precomputed embeddings to KeyBERTInspired.extract_topics

[saikumaru]

What does this PR do?

This PR essentially passes the precomputed embeddings to extract_topics method of KeyBERTInspired to avoid re computing embeddings of documents.

Fixes # #2367

Before submitting

• This PR fixes a typo or improves the docs (if yes, ignore all other checks!).
• Did you read the contributor guideline?
• Was this discussed/approved via a Github issue? Please add a link to it if that's the case.
• Did you make sure to update the documentation with your changes (if applicable)?
• Did you write any new necessary tests?

[MaartenGr]

Thank you for the PR! I left a few small comments but otherwise it is looking good.

[MaartenGr]

Awesome, thank you for your work on this! It's great to have this feature in BERTopic.

[saikumaru]

Happy to contribute. Cheers!