feat: adds the ability to set the index strategy

[tdejager]

This PR enables to set the UV index-strategy from pixi. I would like a test for this so it is still in draft for now :)

closes: #1377

[Hofer-Julian]

The code looks good to me. Ony had minor comments

[tdejager]

BTW I forgot, but before merging we need to change the schema and add docs.

[Hofer-Julian]

BTW I forgot, but before merging we need to change the schema and add docs.

Unrelated to this PR, but I already wondered why we generate the schema from pydantic instead from our Rust struct. I assume that's not easy to do with serde?

[tdejager]

BTW I forgot, but before merging we need to change the schema and add docs.

Unrelated to this PR, but I already wondered why we generate the schema from pydantic instead from our Rust struct. I assume that's not easy to do with serde?

I think the last time we checked that crate was less expressive?

[tdejager]

BTW I forgot, but before merging we need to change the schema and add docs.

Done.