Document LlamaCppChatGenerator

[anakin87]

LlamaCppChatGenerator was introduced in #723 but it was never documented.

[lbux]

Given that I implemented it, I can at least add a README. I'm unsure if/how I could add a proper documentation page on the docs site as there is only an option to suggest changes to an existing page.

[anakin87]

Hey, @lbux! Currently, the process of adding docs for new components is manually handled. We hope to improve it in the future...

In the meantime, if you create a markdown draft and add it to this issue, we can then take care of refining and publishing it.

Similar examples: LlamaCppGenerator, OllamaChatGenerator

I also attach the markdown file for the LlamaCppGenerator, to help you get started:
llamacppgenerator.md.

What do you think? Let us know if you want to take care of it... 💙

[lbux]

Hello, @anakin87. Please see the updated file. I kept it very similar to the regular generator but added small bits that correspond to the additional options available for users (chat_format, json constraining, function calling, etc.). The examples have also been updated and ensured to be working with the exception of the "Using in a Pipeline" section which will work when deepset-ai/haystack#7897 is merged
llamacppchatgenerator.md

[anakin87]

@lbux thank you!

@dfokina coud you please review the markdown and create a new documentation page for LlamaCppChatGenerator?

[dfokina]

Thank you for the draft @lbux ! The doc page is live: https://docs.haystack.deepset.ai/docs/llamacppchatgenerator