JS support for Kotest runner

[nedtwigg]

JS seems like the easiest next step, but PRs for native platforms are welcome too!

• in selfie-lib, move tests from jvmTest to commonTest one by one and implement the missing part
  • most tests are already in commonTest, here is a suggested order for the 5 which are stuck in jvmTest
  • LineReaderTest, SnapshotValueReaderTest, SnapshotReaderTest, SnapshotFileTest (sequentially in one PR)
  • RecordCallTest in its own PR, perhaps needs to stay platform-specific
• in selfie-runner-kotest search for TODO: https://github.com/diffplug/selfie/issues/186
• move HarnessVerifyTest out of jvmTest and into commonTest