feat: plugin updates

[xavidop]

Description

1. Plugins updates
2. Chroma plugin
3. milvus plugin
4. mongo vector plugins

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Code refactoring
• Performance improvement
• Test improvements
• CI/CD improvements

Changes Made

Testing

• Unit tests added/updated
• Integration tests added/updated
• Manual testing performed
• All existing tests pass

Checklist

• My code follows the project's code style guidelines
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published

Documentation

• README updated
• Plugin documentation updated
• API documentation updated
• Sample code updated

Reviewer Notes

[gemini-code-assist]

Code Review

This pull request introduces several new vector database integrations (Chroma, Milvus, Qdrant, and MongoDB Atlas Vector Search) and agent session stores (PostgreSQL and MongoDB) for Genkit Java, alongside extensive documentation and model updates. The review feedback highlights critical performance and safety improvements: batching embedding generation in the indexers of the new vector stores to avoid sequential network request bottlenecks, throwing an exception for empty documents in AwsBedrockEmbedder to prevent index mapping mismatches, and using direct map conversion instead of Extended JSON serialization in MongoSessionStore to avoid parsing issues.

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