Generate API docs for integrations

[masci]

Add a new Hatch command called docs that generates API docs for the integration.

Example PR: #262

Tasks

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1. amazon_bedrock: generate api docs #302
   +0
   
2. astra: generate api docs #303
   +0
   
3. chroma
4. cohere: generate api docs #304
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5. elasticsearch: generate api docs #305
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6. google_ai: generate api docs #306
   contributions wanted! good first issue +2
   
7. google_vertex: generate api docs #307
   contributions wanted! good first issue +2
   
8. gradient: generate api docs #308
   contributions wanted! good first issue +2
   
9. instructor_embedders: generate api docs #309
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10. jina: generate api docs #310
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11. llama_cpp: generate api docs #311
    contributions wanted! good first issue +2
    
12. ollama: generate api docs #312
    contributions wanted! good first issue +2
    
13. opensearch: generate api docs #313
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14. pgvector: generate api docs #314
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15. pinecone: generate api docs #315
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16. qdrant: generate api docs #316
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17. unstructured: generate api docs #317
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18. weaviate: generate api docs #318
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19. CI: sync API docs with readme.com #266
    integration:amazon-bedrock integration:astra integration:chroma integration:cohere integration:elasticsearch integration:google-ai integration:google-vertex integration:gradient integration:instructor-embedders integration:jina integration:llama_cpp integration:ollama integration:opensearch integration:pgvector integration:pinecone integration:qdrant integration:unstructured-fileconverter integration:weaviate topic:CI +19