Improve types, fix translator compatibility for version-related modules (#42638)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/42638

Enables these modules to be covered by `public-api-test`.

- Standardise as CommonJS modules, fixing compatibility with [`flow-api-translator`](https://www.npmjs.com/package/flow-api-translator).
- Use explicit object type in generated file template.

Changelog: [Internal]

Reviewed By: NickGerleman

Differential Revision: D52963967

fbshipit-source-id: c9f3e35f70859c1b99b7297228ee2498f91d9041

scripts/versiontemplates/ReactNativeVersion.js.template

@@ -9,9 +9,16 @@
  * @flow strict
  */
 
-exports.version = {
+const version: $ReadOnly<{
+  major: number,
+  minor: number,
+  patch: number,
+  prerelease: string | null,
+}> = {
   major: ${major},
   minor: ${minor},
   patch: ${patch},
   prerelease: ${prerelease},
 };
+
+module.exports = {version};