sdks/python: integrate Weaviate vector database I/O connector

[mohamedawnallah]

Description

• Design Doc Weaviate Integration
• Source Connector
• Sink Connector
• Enrichment Handler
• Unit Test
• Integration Test
• Update I/O Connector Docs

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[mohamedawnallah]

Ping

[derrickaw]

waiting on author

[mohamedawnallah]

This PR can be community contributed. It can mirrors the existing implementation semantics for Milvus in a relatively straightforward way.

Seeing Milvus Enrichment Handler: https://github.com/apache/beam/blob/master/sdks/python/apache_beam/ml/rag/enrichment/milvus_search.py

Seeing Milvus Sink I/O Connector:
#35708

Closing for now