Changes to Call the read-only MCP JSON-RPC endpoint

added required request body

added the new optional header request parameter MCP-Protocol-Version

added the new optional header request parameter Mcp-Method

added the new optional header request parameter Mcp-Name

added the media type application/json for the response with the status 200

added the non-success response with the status 400

added the non-success response with the status 403

added the non-success response with the status 404

added the non-success response with the status 413

added the non-success response with the status 415

added the non-success response with the status 500

removed the success response with the status 204

added the success response with the status 202