Summary

Integrate MCP Resources. This allows MCP servers to expose data and content that can be read by clients and used as context for LLM interactions.

Key changes:

• Added three abstract methods to the to the base class MCPServer: list_resources, list_resource_templates and read_resource
• Implemented the abstract methods in the base class _MCPServerWithClientSession which is parent of classes MCPServerStdio, MCPServerSse , and MCPServerStreamableHttp.
• Created example MCP resources server with working demonstration.
• Updated documentation with MCP resources usage examples.

Note: This PR does not implement subscribe_resource and unsubscribe_resource methods.

Test plan

Unit tests: Added 4 comprehensive tests in tests/mcp/test_resources_server.py covering:

• Resources listing and retrieval
• Error handling for missing resource
• Integration tests: Updated existing MCP test suite to handle new abstract methods

Example verification: Created working example with MCP resources server and client
All tests pass: 453/453 tests passing after adding optional dependencies

Issue number

Partially addresses #544 (resources only)

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