Support mcp resources

[danilo-rasa]

Summary

Add MCP resource support to enable context data provision to agents. This enhancement allows MCP servers to expose resources (configuration, documentation, metrics, etc.) that agents can read and use as context.

Test plan

• Unit tests: Added 11 tests in tests/mcp/test_resource_server.py covering:
• Resource listing and retrieval
• URI format validation
• Multiple resources with different MIME types
• Agent integration with resource-provided context
• Streaming and non-streaming scenarios
• Error handling for missing resources
• Resource cleanup

Issue number

Addresses issue #544 - the prompts implementation was done in a previous PR.

Checks

• I've added new tests (if relevant)
• I've added/updated the relevant documentation
• I've run make lint and make format
• I've made sure tests pass

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