Remove remaining Node imports from core

Summary:
Removed remaining path / fs imports from Flipper core.

`expand-tide` needed replacement too, but noticed that it never actually rewrites paths since all use cases were already using absolute paths, so removed it instead.

Reviewed By: aigoncharov

Differential Revision: D33017654

fbshipit-source-id: e12f66ef68b5f9e4279411c94445a2fb87249e9a

desktop/flipper-plugin/src/plugin/DevicePlugin.tsx

@@ -30,7 +30,7 @@ export interface Device {
   clearLogs(): Promise<void>;
   sendMetroCommand(command: string): Promise<void>;
   navigateToLocation(location: string): Promise<void>;
-  screenshot(): Promise<Buffer>;
+  screenshot(): Promise<Uint8Array>;
 }
 
 export type DevicePluginPredicate = (device: Device) => boolean;