message: Return value after executing command request
diff: @@ -2147,7 +2147,7 @@ class ExecuteCommandFeature implements DynamicFeature<ExecuteCommandRegistration
  command,
  arguments: args
  };
  - client.sendRequest(ExecuteCommandRequest.type, params).then(
  + return client.sendRequest(ExecuteCommandRequest.type, params).then(
  undefined,
  (error) => {
  client.logFailedRequest(ExecuteCommandRequest.type, error);
  