Add TRawResponse type to ClientQuery

Summary:
Add TRawResponse type to ClientQuery

In D38199301 I have a query like this with `raw_response_type` because I want to use it with `commitPayload` and get the raw response type to populate the local client state initially:
```
const QUERY = graphql`
  query PMTCalibrationV3ContainerQuery
  fb_owner(oncall: "people_performance")
  raw_response_type {
    pmt_client_state {
      calibration_state {
        show_confidential_information
      }
    }
  }
`;

const INITIAL_DATA: PMTCalibrationV3ContainerQuery$rawResponse = {
  pmt_client_state: {calibration_state: {show_confidential_information: false}},
};

environment.commitPayload(OPERATION, INITIAL_DATA);
```
However this leads to the following generated code in `PMTCalibrationV3ContainerQuery.graphql.js` which is invalid:
```
module.exports = ((node/*: any*/)/*: ClientQuery<
  PMTCalibrationV3ContainerQuery$variables,
  PMTCalibrationV3ContainerQuery$data,
  PMTCalibrationV3ContainerQuery$rawResponse,
>*/);
```

I'm just matching the definition of the regular `Query` and hoping this is safe to do, since it doesn't seem like it actually does anything type checking wise

Reviewed By: alunyov

Differential Revision: D38293946

fbshipit-source-id: 7b56384b8bbd0cad5d261fab0ef41acd7ea87718

packages/relay-runtime/util/RelayRuntimeTypes.js

@@ -117,6 +117,7 @@ declare export opaque type Query<
 declare export opaque type ClientQuery<
   -TVariables: Variables,
   +TData,
+  TRawResponse = void,
 >: ClientRequest;
 
 /**