Introduce pluginKey

Summary: Exposed the `pluginKey` to sandy plugins (which we will use later for storing table preferences per plugin). And a little moving code around because circular deps problem roared its ugly head again.

Reviewed By: nikoant

Differential Revision: D27009721

fbshipit-source-id: 7ad29e72ff8028c9daae270c4749b657bd8ff049

desktop/app/src/utils/exportData.tsx

@@ -25,7 +25,6 @@ import {
   PluginDefinition,
   DevicePluginMap,
   ClientPluginMap,
-  isSandyPlugin,
 } from '../plugin';
 import {default as BaseDevice} from '../devices/BaseDevice';
 import {default as ArchivedDevice} from '../devices/ArchivedDevice';
@@ -46,7 +45,7 @@ import {setSelectPluginsToExportActiveSheet} from '../reducers/application';
 import {deconstructClientId, deconstructPluginKey} from '../utils/clientUtils';
 import {performance} from 'perf_hooks';
 import {processMessageQueue} from './messageQueue';
-import {getPluginTitle} from './pluginUtils';
+import {getPluginTitle, isSandyPlugin} from './pluginUtils';
 import {capture} from './screenshot';
 import {uploadFlipperMedia} from '../fb-stubs/user';
 import {Idler} from 'flipper-plugin';