Make getFlipperLib generally available, and use it to decouple opening links from Electron

Summary:
This stack reduces our direct dependency on Electron, for example by exposing our own API to open links.

Also exposing `getFlipperLib` as API from `flipper-plugin`, so that these utility methods are available outside plugin contexts as well.

Reviewed By: timur-valiev

Differential Revision: D29661689

fbshipit-source-id: 0c0523326eeb0d9d8fbe3e03c4609327bb53596b

desktop/app/src/init.tsx

@@ -40,13 +40,13 @@ import {
   _LoggerContext,
   Layout,
   theme,
+  getFlipperLib,
 } from 'flipper-plugin';
 import isProduction from './utils/isProduction';
 import {Button, Input, Result, Typography} from 'antd';
 import constants from './fb-stubs/constants';
 import styled from '@emotion/styled';
 import {CopyOutlined} from '@ant-design/icons';
-import {clipboard} from 'electron/common';
 import {getVersionString} from './utils/versionString';
 import {PersistGate} from 'redux-persist/integration/react';
 import {ipcRenderer} from 'electron';
@@ -107,7 +107,7 @@ class AppFrame extends React.Component<
                 key="copy_error"
                 icon={<CopyOutlined />}
                 onClick={() => {
-                  clipboard.writeText(this.getError());
+                  getFlipperLib().writeTextToClipboard(this.getError());
                 }}>
                 Copy error
               </Button>,