Gradle build & test

Leaner Readmes for Room and SQLDelight, linking to docs #615

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Run time

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Job	Run time
Test macos-watchos-tvos	6m 26s
Test ubuntu	1m 16s
Test mac-jvm	1m 44s
Test mac-ios-macos	6m 39s
Test windows	1m 42s
	17m 47s