Fix: Make embedchain optional to resolve browser-use compatibility (fixes #2702)

[devin-ai-integration]

Fix: Make embedchain optional to resolve browser-use compatibility

This PR resolves the dependency conflict between browser-use>=0.1.40 and crewAI[tools]>=0.114.0 by making embedchain an optional dependency and providing alternative adapters.

Issue

When users try to use browser-use>=0.1.40 together with crewAI[tools]>=0.114.0, they encounter a dependency conflict due to incompatible langchain-openai version requirements:

• browser-use>=0.1.40 requires langchain-openai==0.3.1 or higher
• embedchain (used by crewAI-tools) requires langchain-openai<0.3.0,>=0.2.1

This fixes issue #2702.

Changes

• Made embedchain an optional dependency
• Created custom adapters that don't depend on embedchain
• Modified RagTool and PDFSearchTool to use the custom adapters when embedchain is not available
• Added tests to verify the fix

Testing

• Added tests for the custom adapters
• Added a compatibility test to verify that the solution fixes the browser-use compatibility issue

Link to Devin run: https://app.devin.ai/sessions/db87bfd9f9ec4ff5a273bd6ebc19bbfc
Requested by: Joe Moura (joao@crewai.com)

[devin-ai-integration]

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[devin-ai-integration]

Closing due to inactivity for more than 7 days.