feat: add UCLTool integration

[sarmadnawaz]

Add UCLTool wrapper that enables CrewAI agents to access tools and integrations through the ucl.dev platform.

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Note

Adds a new UCLTool that integrates with UCL (Unified Context Layer) to fetch and invoke external actions for agents.

• New module tools/ucl_tool/ with ucl_tool.py implementing UCLToolConfig, UCLTool, from_config, get_tools, from_action, dynamic args via JSON schema, and request helpers (_get_headers, _fetch_tools, _execute_tool)
• Exposes UCLTool in tools/__init__.py (import and __all__)
• Adds README.md with setup, usage examples, and API reference
• Adds comprehensive tests tests/tools/ucl_tool_test.py covering config, headers, tool discovery, execution, schema conversion, and _run behavior

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