Add uploading to internal cloud storage

Summary:
Design doc: https://docs.google.com/document/d/1HLCFl46RfqG0o1mSt8SWrwf_HMfOCRg_oENioc1rkvQ/edit#

We'll use it in the subsequent diff to automatically upload a universal export

Reviewed By: passy

Differential Revision: D40585810

fbshipit-source-id: 5b409d716c2ead040865130d379d4f593cb68483

desktop/flipper-common/src/server-types.tsx

@@ -325,6 +325,7 @@ export type FlipperServerCommands = {
   'intern-upload-scribe-logs': (
     messages: {category: string; message: string}[],
   ) => Promise<void>;
+  'intern-cloud-upload': (path: string) => Promise<string>;
   shutdown: () => Promise<void>;
   'is-logged-in': () => Promise<boolean>;
   'environment-info': () => Promise<EnvironmentInfo>;