Remove fs and os usage from Mobile Builds plugin

Summary: Changelog: Expose env info and FS rm command to flipper plugins.

Reviewed By: mweststrate

Differential Revision: D32988478

fbshipit-source-id: 3d0233f9eb34d3478b07e39b9401c0e30ca95135

desktop/flipper-plugin/src/index.ts

@@ -133,6 +133,7 @@ export {createTablePlugin} from './utils/createTablePlugin';
 export {textContent} from './utils/textContent';
 import * as path from './utils/path';
 export {path};
+export * from './utils/uuid';
 
 // It's not ideal that this exists in flipper-plugin sources directly,
 // but is the least pain for plugin authors.