build, test and release sqlite-sync

Update README with CloudSync extension loading Screenshot #412

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Run time

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Job	Run time
android-x86_64 build + test	6m 39s
linux-musl-arm64 build + test	4m 53s
linux-x86_64 build + test	1m 55s
macos build + test	2m 47s
ios-sim build	1m 36s
linux-arm64 build + test	4m 5s
apple-xcframework build	2m 57s
linux-musl-x86_64 build + test	13s
wasm build	4m 54s
windows-x86_64 build + test	7m 42s
android-arm64-v8a build	3m 35s
ios build	54s
release	0s
	42m 10s