Add DataStax Astra DB vector store driver

[hemidactylus]

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Describe your changes

Adds an AstraDBVectorStoreDriver class, plus:

• mkdocs.yaml
• changelog
• a new end-to-end example on the docs ("query a web page" with Astra DB for vector store)
• a specific new extra in the pyproject.yaml
• unit test
• integration test (requires secrets/connection params to an Astra database)

Notes

I can run the integration testing on my machine (all green). Depending on Griptape's policy on integration testing, I can share secrets to a dedicated CI database or similar, just let me know if that is a valid option.

Also, I noticed that the number of returned vectors in the query method is generally called count (as I did and as other drivers do); but at least one example in the docs seems to refer to it as top_n. Is it preferred that the method accepts both parameter names, perhaps?

Issue ticket number and link

Closes #1021

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📚 Documentation preview 📚: https://griptape--1022.org.readthedocs.build//1022/

[collindutter]

Thanks for the PR @hemidactylus! Will review this in detail next week.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

📢 Thoughts on this report? Let us know!

[hemidactylus]

Thank you so much, @collindutter ! Meanwhile I should have addressed the test coverage issues reported above. Cheers!

[collindutter]

Great work! Thank you for putting the time into creating consistent documentation and passing tests -- it is greatly appreciated :)

[hemidactylus]

(replying about the renaming of the mock_output parameter)

Sounds good to me -- renamed.

Only, I had to take out the Factory layer: the mock_output has to be a function, so I went for

default=lambda chunk: [0, 1]

(alternatively, I guess default=Factory(lambda: lambda chunk: [0, 1]) would work as well - but I suppose it's not necessary since the "innermost" lambda does not look like a 'dangerous' mutable thing. I may be mistaken though)

[collindutter]

Great work again @hemidactylus! And thanks for working with me through the requested changes.

Just need to do some testing on a live AstraDb instance and then we'll be good to merge 🥳

[hemidactylus]

That's great news @collindutter ! Do you want me to assist you with the (actually very simple) setup for integration testing? Please do let me know!

[collindutter]

I appreciate the offer! I should be good, but will reach out if I have any questions.

[collindutter]

@hemidactylus I tested it out, everything worked great! I'm recreating the PR in our repo so that integration tests can run with our secrets, but all the commits from your fork are still present.

Thanks again for the excellent integration.