Move flipper plugin from flipper-lib types to flipper-common

Summary: Moved all types related to plugin descriptions from plugin-lib (which handles downloads and such) to flipper-common. The goal of that is to remove all plugin-lib usage from ui-core to server-core, so that the UI itself doesn't do any file operations anymore related to plugins. That will be done in next diffs, this just moves types but no code.

Reviewed By: nikoant, aigoncharov

Differential Revision: D32665064

fbshipit-source-id: 86d908e7264569b0229b09290a891171876c8e00

desktop/scripts/build-utils.ts

@@ -18,12 +18,11 @@ import {
   stripSourceMapComment,
 } from 'flipper-pkg-lib';
 import getAppWatchFolders from './get-app-watch-folders';
-import {
-  getSourcePlugins,
-  getPluginSourceFolders,
+import {getSourcePlugins, getPluginSourceFolders} from 'flipper-plugin-lib';
+import type {
   BundledPluginDetails,
   InstalledPluginDetails,
-} from 'flipper-plugin-lib';
+} from 'flipper-common';
 import {
   appDir,
   staticDir,