Add build script to react-native-babel-transformer

[dmytrorykun]

Summary: When metro-react-native-babel-transformer was part of Metro, Metro would take care of building flow-typed src before publishing. React Native doesn't do that.

This diff adds build script, prepare and postpublish hooks to react-native-babel-transformer. The script is effectively is a copy-paste from react-native-codegen, we'll deduplicate them in the future.

Changelog: [Internal] - Add build script to react-native-babel-transformer

Differential Revision: D47006627

[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D47006627

[analysis-bot]

Platform	Engine	Arch	Size (bytes)	Diff
android	hermes	arm64-v8a	9,001,460	-2
android	hermes	armeabi-v7a	8,255,374	-1
android	hermes	x86	9,510,502	-4
android	hermes	x86_64	9,356,366	-3
android	jsc	arm64-v8a	9,614,525	-4
android	jsc	armeabi-v7a	8,741,023	-4
android	jsc	x86	9,701,382	-2
android	jsc	x86_64	9,947,941	-2

Base commit: 0519c11acd0c347db378bbc9238c7dabfd38f6fa Branch: main

[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D47006627

[github-actions[bot]]

	Warnings
:warning:	:lock: package.json - Changes were made to package.json. This will require a manual import by a Facebook employee.

Generated by :no_entry_sign: dangerJS against 1ea7e2d8084a88299e68c74393f6d09f0a2c42ae

[cortinico]

Closing as abandoned internally