chore(js): add expo example app and move to pnpm #776

Job	Run time
Run checks (ubuntu-latest)	30s
Run checks (macos-latest)	30s
Run checks (windows-latest)	58s
Build library (iOS) (aarch64-apple-ios)	2m 33s
Build library (Android) (aarch64-linux-android)	4m 46s
Build library (linux-aarch64, ubuntu-latest, libaries_askar.so, aarch64-unknown-linux-gnu, true)	3m 38s
Build library (iOS) (aarch64-apple-ios-sim)	2m 14s
Build library (Android) (armv7-linux-androideabi)	4m 46s
Build library (linux-x86_64, ubuntu-latest, libaries_askar.so, x86_64-unknown-linux-gnu, true)	3m 31s
Build library (iOS) (x86_64-apple-ios)	3m 27s
Run tests (ubuntu-latest)	3m 16s
Build library (Android) (i686-linux-android)	4m 32s
Build library (darwin-universal, macos-latest, libaries_askar.dylib, darwin-universal, beta)	3m 3s
Run tests (macos-latest)	2m 11s
Build library (Android) (x86_64-linux-android)	4m 29s
Build library (windows-x86_64, windows-latest, aries_askar.dll, x86_64-pc-windows-msvc)	3m 47s
Run tests (windows-latest)	4m 57s
Create iOS xcframework	34s
Build and test JavaScript wrapper (linux-aarch64)	50s
Build and test JavaScript wrapper (linux-x86_64)	1m 8s
Build and test Python wrapper (linux-aarch64, 3.8)	19s
Build and test JavaScript wrapper (darwin-universal)	57s
Build and test Python wrapper (linux-x86_64, 3.8)	27s
Build and test Python wrapper (darwin-universal, 3.8)	53s
Build and test Python wrapper (windows-x86_64, 3.8)	52s
Create library (Android)	7s
Create iOS and Android release assets	0s
Successful build	1s
	59m 16s

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