Add test asserting shape of public JS API (#42265)

Summary:
Pull Request resolved: #42265

Adds a snapshot test against the `react-native` package which emits the shape of all Flow-typed modules under `Libraries/`, as an approximation of the public JS API.

This provides:
- Visibility for maintainers on any PR which changes the shape of the public API.
- An at-a-glance diff of changed APIs between React Native versions (useful for library integrators and the Release Crew).

Note — **workflow change**: Maintainers modifying public files/function signatures under Libraries/ will need to run `yarn jest -u` and commit the updated snapshot changes.

Changelog: [Internal]

Reviewed By: TheSavior, philIip, mdvacca

Differential Revision: D52729777

fbshipit-source-id: 90ca2924b50205485b6d49e52a2889d8e00a43b9

package.json

@@ -88,6 +88,7 @@
     "flow-bin": "^0.226.0",
     "glob": "^7.1.1",
     "hermes-eslint": "0.18.2",
+    "hermes-transform": "0.18.2",
     "inquirer": "^7.1.0",
     "jest": "^29.6.3",
     "jest-junit": "^10.0.0",