Install plugin from package file

Summary:
Adding a way to install plugins directly from package files. This is required for testing after packaging format changes.

Stage 3: Implemented installation of plugins directly from package file.

Reviewed By: jknoxville

Differential Revision: D19765619

fbshipit-source-id: 57f36c87d3cf5d4e1c9a1f8f9f9f32b14a18bc8b

types/live-plugin-manager.d.tsx

@@ -13,6 +13,13 @@ export declare class PluginManager {
     name: string,
     version?: string,
   ): Promise<LivePluginManager.IPluginInfo>;
+  installFromPath(
+    location: string,
+    options?: {
+      force: boolean;
+    },
+  ): Promise<LivePluginManager.IPluginInfo>;
+
   readonly options: LivePluginManager.PluginManagerOptions;
 }