Add compact option (#49979)

Summary:
If you use this preset to create library code, it is often helpful to be able to still read the transpiled code, even when sourcemaps are available.

This change adds a compact option which allows for disabling the default behavior that removes whitespace from the transpiled files.

## Changelog:

<!-- Help reviewers and the release process by writing your own changelog entry.

Pick one each for the category and type tags:

[GENERAL] [ADDED] - Add `compact` option to `react-native/babel-preset` to allow disabling whitespace removal

For more details, see:
https://reactnative.dev/contributing/changelogs-in-pull-requests

Pull Request resolved: https://github.com/facebook/react-native/pull/49979

Reviewed By: rshest

Differential Revision: D71109024

Pulled By: robhogan

fbshipit-source-id: ab205cca2a82b56955d1e1c55e288dcbe7754f8f

packages/react-native-babel-preset/src/configs/main.js

@@ -206,7 +206,7 @@ const getPreset = (src, options) => {
 
   return {
     comments: false,
-    compact: true,
+    compact: options.compact !== false,
     overrides: [
       // the flow strip types plugin must go BEFORE class properties!
       // there'll be a test case that fails if you don't.