Rename package to 'flipper'

Summary:
- rename package `'sonar'` > `'flipper'`
- rename package `'sonar-static'` > `'flipper-static'`
- rename package export from `window.Sonar` to `window.Flipper`

Reviewed By: passy

Differential Revision: D9851181

fbshipit-source-id: 34d4447c3b287496b3d20ddb54471ce777ec74e1

src/ui/components/elements-inspector/ElementsInspector.js

@@ -8,7 +8,7 @@
 import {Component} from 'react';
 import FlexRow from '../FlexRow.js';
 import {Elements} from './elements.js';
-import type {ContextMenuExtension} from 'sonar';
+import type {ContextMenuExtension} from 'flipper';
 
 export type ElementID = string;