Endpoints for LLM, Embedder and Plugin settings

[zAlweNy26]

Description

I added:

• One endpoint for LLM settings to get the settings and schema of a specific LLM
• One endpoint for Embedder settings to get the settings and schema of a specific Embedder
• One endpoint for Plugin settings to get the list of all the settings and schemas of the available plugins

I also moved the endpoints to a more generic name, so that in future we can add other endpoints related to them.

Type of change

• New feature (non-breaking change which adds functionality)
• This change requires a documentation update

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas

[zAlweNy26]

@pieroit would you prefer like that or directly /{collection_id}/{memory_id}/ ?

[pieroit]

let's leave point, in the future we may consider other aspects of a collection as a resource

[zAlweNy26]

Ok, perfect!

[pieroit]

thanks for fixing the tests!!!
Going for /collections/{collection_id}/points/{memory_id}/ which should be the most RESTful

[pieroit]

Closing this PR because I cannot rebase it to branch zAlweNy26-specific_llm-embedder-plugin_settings

Your commits are saved and part of the history as you can see here, so they will end up in develop and then main.

Thanks 👯