Rename FantomRenderedOutput as getFantomRenderedOutput to follow convention (#48141)

Summary:
Pull Request resolved: #48141

Changelog: [internal]

This just aligns the file name with the common convention to name modules with the same name as their default export (if any).

Reviewed By: javache

Differential Revision: D66874227

fbshipit-source-id: 2a619b434c26a29f1774cba1c32ba711b1a7af46

Author: rubennorte

packages/react-native-fantom/src/FantomRenderedOutput.js renamed to packages/react-native-fantom/src/getFantomRenderedOutput.js

@@ -11,10 +11,10 @@
 import type {
   FantomRenderedOutput,
   RenderOutputConfig,
-} from './FantomRenderedOutput';
+} from './getFantomRenderedOutput';
 import type {MixedElement} from 'react';
 
-import getFantomRenderedOutput from './FantomRenderedOutput';
+import getFantomRenderedOutput from './getFantomRenderedOutput';
 import ReactFabric from 'react-native/Libraries/Renderer/shims/ReactFabric';
 
 let globalSurfaceIdCounter = 1;