[mcp] integrate basic MCP server into the language server #1593
Description
Integrate an MCP server implementation into the spring language server, so that it can work as an MCP server for the surrounding coding environment (or even from outside).
The embedded MCP server then needs to use the MCP HTTP streaming transport (not STDIO, since that is already in use for the language server protocol + we assume that the language server lifecycle is controlled by the language server client, so that the MCP client talking to the embedded MCP server should not try to control the lifecycle of the MCP server as well).