Further decouple server from UI

Summary: Further decoupling of `server/` from the rest of the code base. Also fixed a problem with promise chaining causing promises to create unhandled rejection errors.

Reviewed By: passy

Differential Revision: D31474919

fbshipit-source-id: 027cccbe9b57d856c94d63c093d39b6cb3e53312

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

@@ -40,6 +40,12 @@ export type DeviceDescription = {
   readonly sdkVersion?: string;
 };
 
+export type UninitializedClient = {
+  os: string;
+  deviceName: string;
+  appName: string;
+};
+
 export type ClientQuery = {
   readonly app: string;
   readonly os: DeviceOS;
@@ -79,6 +85,7 @@ export type FlipperServerEvents = {
     serial: string;
     entry: DeviceLogEntry;
   };
+  'client-setup': UninitializedClient;
   'client-connected': ClientDescription;
   'client-disconnected': {id: string};
   'client-message': {