feat: add ability to delete by filtering metadata only

[jeanmaried]

What kind of change does this PR introduce?

Feature

What is the current behavior?

I need to be able to delete vectors based solely on their metadata but currently the only way to do so is to already have the ids.

What is the new behavior?

I added 2 methods as suggestions.
Option #1: add a delete_by_metadata
Option #2: delete_vectors (temporary name) a suggestion for updating the current delete function to allow optionally passing the ids or metdata (one or the other).

Please let me know which is an acceptable approach and if there are any objections to having this capability.

[olirice]

Deleting by metadata sounds reasonable. I think the right way to approach it would be to overload the existing delete method in a backwards compatible way

Something like:

From

def delete(self, ids: Iterable[str]) -> List[str]:

To

def delete(self, ids: Optional[Iterable[str]] = None, filters: Optional[Metadata] = None) -> List[str]:

where filters goes through the same build_filter logic as query.

[jeanmaried]

@olirice thank you, I updated the method and the docs.

[olirice]

This PR introduces some LOC that aren't covered by the test suite. Could you add tests to handle the new uses case?

These are the uncovered lines:

[olirice]

very nice, thank you!