Gradle build & test

Move `PowerSyncKotlin/` to `internal/` #635

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Run time

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Job	Run time
android_emulator	6m 11s
Test macos-watchos-tvos	8m 6s
Test mac-ios-macos	13m 15s
Test ubuntu	3m 44s
Test mac-jvm	3m 34s
Test windows	3m 40s
	38m 30s