Refactor post-install script to not depend on fs-extra #2995

Job	Run time
Bundle TypeScript	2m 6s
Build for linux x64	1m 32s
Build for linux arm	2m 3s
Build for linux arm64	2m 16s
Build for windows x64	4m 46s
Build for windows ia32	4m 53s
Build for android x86_64	3m 34s
Build for android armeabi-v7a	2m 22s
Build for android arm64-v8a	2m 35s
Build for android x86	2m 59s
Build for darwin x64	6m 26s
Build for darwin arm64	3m 45s
Build for ios simulator	5m 1s
Build for ios catalyst	11m 37s
Build for ios ios	7m 10s
Generate Info.plist with all frameworks in place	34s
Integration tests (test:ci) for node on linux	7m 13s
Integration tests (test:ci:main) for electron on linux	6m 9s
Integration tests (test:ci:renderer) for electron on linux	4m 57s
Integration tests (test:ci:main) for electron on darwin	6m 38s
Integration tests (test:ci:renderer) for electron on darwin	7m 4s
Integration tests (test:ci) for node on darwin	14m 2s
Integration tests (test:ci:android) for react-native on android	25m 17s
Integration tests (test:ci:ios) for react-native on ios	24m 45s
	2h 39m 44s

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