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[EXPERIMENTAL] Decompose McpSchema nested types into top-level feature packages by tzolov · Pull Request #857 · modelcontextprotocol/java-sdk

@tzolov 

- Extracts most domain types from the McpSchema god-class into
  dedicated top-level classes under spec.schema.resource/prompt/
  tool/sample/elicit.

- Extracts the JSON-RPC types from the McpSchema god-class into
  dedicated top-level classes under spec.jsonrpc

- Moves JSONRPC_VERSION and deserializeJsonRpcMessage to a
  new JSONRPC utility class. Request, Result, and Notification are no longer
  sealed.

- Adds mcp-migrate module with OpenRewrite recipes for automated user-side
  migration, and MIGRATION-1.1.md documenting every breaking change.

Signed-off-by: Christian Tzolov <christian.tzolov@broadcom.com>