Convert plugin.js to plugin.tsx

Summary:
* Deletes plugin.js
* Adds plugin.tsx
* Adds plugin flow-typed module that has the old flow types

Reviewed By: passy

Differential Revision: D16668067

fbshipit-source-id: b2f0ce47c4cf7125b4e352821e921b97675d12a9

src/plugins/logs/index.js

@@ -13,7 +13,7 @@ import type {
 } from 'flipper';
 import type {Counter} from './LogWatcher.js';
 import type {DeviceLogEntry} from '../../devices/BaseDevice.js';
-import type {Props as PluginProps} from '../../plugin';
+import type {Props as PluginProps} from '../../plugin.tsx';
 
 import {
   Text,