Allow specifying cache dir for fastembed

[KaQuMiQ]

This commit adds ability to specify cache dir for fastembed when setting up the client embedding model. This allows managing models data locally and ensure proper/altered paths on docker when needed.

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[NirantK]

The async_qdrant_xxx files are auto-generated from the base ones. The header of those files indicates so. This looks like a useful contribution. Would you mind adding this to the corresponding file in this PR itself? That might be qdrant_fastembed.py

[KaQuMiQ]

Sure @NirantK ! I have missed that information 🙈 Should be fixed now

[joein]

Hi @KaQuMiQ

Now your PR won't pass CI
There is a check which ensures that async client is up-to-date
It launches the generator and then check diffs in the async files
You can launch generator on your own (https://github.com/qdrant/qdrant-client/blob/master/tools/generate_async_client.sh)
And then push the changes, or you can leave it to us

Tests which checks whether async client is up-to-date can be found here https://github.com/qdrant/qdrant-client/blob/master/tests/async-client-consistency-check.sh

Tell me if you want to do it on your own or if you want us to finish it

Thank you!

[KaQuMiQ]

Sure, should be fixed now @joein

[joein]

Seems ok

The only thing that I might want to update is type hint
I'd probably prefer to have Optional[Union[str, Path]] and not just Optional[str], but for that we need to update fastembed as well (@NirantK)

[joein]

We've put off this one for unknown reasons 🙈

Sorry for this, but thank you for your efforts!

Closing this now in favour of #416