What does this PR do?

This PR adds support for the recently released Qwen3 Embedding models on the Hugging Face Hub.

Note that re-ranking support won't be introduced in this PR but on a follow up PR, as well as MPS support eventually too.

Closes #626

Before submitting

• This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
• Did you read the contributor guideline, Pull Request section?
• Was this discussed/approved via a GitHub issue or the forum? Please add a link to it if that's the case.
• Did you make sure to update the documentation with your changes? Here are the documentation guidelines, and here are tips on formatting docstrings.
• Did you write any new necessary tests?

Who can review?

@Narsil