feat(mcp): add configurable request timeout to MCP server (#134)

Adds the ability to configure request timeouts for MCP server operations. This enhancement
allows setting a custom duration to wait for server responses before timing out requests,
which applies to all requests made through the client including tool calls, resource access,
and prompt operations.

- Add requestTimeout parameter to McpServerSession constructor
- Add requestTimeout field and builder method to server classes
- Pass timeout configuration through to session creation
- Add tests for both success and failure scenarios across different transport implementations
- Default timeout is set to 10 seconds if not explicitly configured.