[zk-sdk] Create `zk-sdk` crate #1285

Job	Run time
android (ubuntu-20.04, x86_64-linux-android)	3m 6s
android (ubuntu-20.04, aarch64-linux-android)	3m 9s
ios (macos-11, aarch64-apple-ios)	9m 31s
android (ubuntu-20.04, i686-linux-android)	3m 6s
ios (macos-11, x86_64-apple-ios)	7m 30s
android (ubuntu-20.04, armv7-linux-androideabi)	3m 18s
ios (macos-11, aarch64-apple-darwin)	8m 11s
ios (macos-11, x86_64-apple-darwin)	7m 17s
error_reporting	0s
	45m 8s

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