feat(completion): implement completion API support (#141)

Add completion API support to the MCP protocol implementation:

- Add CompleteRequest and CompleteResult schema classes
- Implement completion capabilities in ServerCapabilities
- Add completion handlers in McpAsyncServer and McpServer
- Add completion client methods in McpAsyncClient and McpSyncClient
- Add CompletionRefKey and completion specifications in McpServerFeatures
- Add integration test for completion functionality
- Fix isPresent() check to use isEmpty() in WebMvcSseServerTransportProvider
- Replace McpServerFeatures.CompletionRefKey by McpSchemaCompleteReference

Co-authored-by: Christian Tzolov <christian.tzolov@broadcom.com>

Signed-off-by: jitokim <pigberger70@gmail.com>