Gradle build & test

Move `PowerSyncKotlin/` to `internal/` #633

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Run time

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Job	Run time
android_emulator	6m 5s
Test mac-ios-macos	13m 35s
Test macos-watchos-tvos	13m 51s
Test mac-jvm	6m 37s
Test windows	3m 42s
Test ubuntu	3m 42s
	47m 32s