Make plugin loading async

Summary: This diff makes plugin loading async, which we'd need in a browser env (either because we'd use `import()` or we need to fetch the source and than eval it), and deals with all the fallout of that

Reviewed By: timur-valiev

Differential Revision: D32669995

fbshipit-source-id: 73babf38a6757c451b8200c3b320409f127b8b5b

desktop/flipper-common/src/index.tsx

@@ -25,6 +25,7 @@ export {
   reportPlatformFailures,
   reportUsage,
   reportPluginFailures,
+  tryCatchReportPluginFailuresAsync,
   tryCatchReportPlatformFailures,
   tryCatchReportPluginFailures,
   UnsupportedError,