add tests for vector operations

[generall]

Fixes #270.

• Add tests for vector updates and deletes
• Fix problems with those methods
• Fix type matching
• Fix test error in case of deleted vectors (related to the new logic of vector deletion, changed in Fix missing points, vectors and payload qdrant#2514 )

[timvisee]

Thanks for the fix. Tested it locally with the snippet that previously failed as well, and that works fine now (with vectors=).

I do see an issue with our argument name though, please see my comment below:

[timvisee]

Our Python client now still uses vectors, while our gRPC/REST API uses points.

Our documentation also suggests to use points: https://qdrant.tech/documentation/concepts/points/#update-vectors

I prefer points because you provide a list of points (with vectors), and not a list of vectors directly.

Do we leave as is and update our documentation, or do we switch to points? I like the latter better.

[generall]

let's switch