Add Weaviate integration

[hunteritself]

Add Weaviate integration, features include:

1. Initiate the required environment and connect to Weaviate vector database;
2. Create a class;
3. Delete a class;
4. Add data;
5. Make similarity-based queries.

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[github-actions]

👋 Hello @hunteritself, thanks for submitting a EVA DB PR 🙏 To allow your work to be integrated as seamlessly as possible, we advise you to:

• ✅ Verify that your PR is up-to-date with georgia-tech-db/eva master branch. If your PR is behind you can update your code by clicking the 'Update branch' button or by running git pull and git merge master locally.
• ✅ Verify that all EVA DB Continuous Integration (CI) checks are passing.
• ✅ Reduce changes to the absolute minimum required for your bug fix or feature addition.

[xzdandy]

Could you fix the merge conflicts? Thanks!

[jarulraj]

Nice PR! Can we also add support for label-based filtering? -- https://weaviate.io/developers/weaviate/search/filters. Like searching only among a subset of documents that satisfy some label value (e.g., label = 'cs450'). We can discuss more via Slack.

[hunteritself]

Sure Professor. I'll add this "label-based filtering" feature soon.

[xzdandy]

Hi @hunteritself, could you add a test case and documentation please?

• For documentation, you can use https://evadb.readthedocs.io/en/stable/source/reference/vector_databases/index.html as a reference.
• For test case, you can use https://github.com/georgia-tech-db/evadb/blob/staging/test/integration_tests/long/test_similarity.py this as a reference.

[xzdandy]

You can fix the linter by running bash script/test/test.sh -m LINTER

[hunteritself]

Hi Andy,

I have fixed all the code formatting errors suggested. The local test bash script/test/test.sh -m LINTER has passed. But the CircleCI test on GitHub still failed, showing test/integration_tests/long/test_similarity.py has incorrect formatting. Could you please help take a look? Thank you.