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kotlinlang

Since `Clock` and `Instant` are about to go stable in the stdlib, is there any willingness to add a Clock implementation in the test coroutines artifact that reflects the current time of the test scheduler?

I've implemented something like this in numerous projects. Would be great to have it out of the box since this stuff is in the stdlib now.

```@OptIn(ExperimentalCoroutinesApi::class)
@ExperimentalTime
private class TestClock(private val scheduler: TestCoroutineScheduler) : Clock {
    override fun now() = Instant.fromEpochMilliseconds(scheduler.currentTime)
}

@ExperimentalTime
val TestScope.testClock: Clock get() = TestClock(testScheduler)```

It is since Kotlin 2.2.20-Beta2: `testTimeSource.asClock(origin = Instant.parse("2025-02-09T05:11:05.005Z"))`: <https://youtrack.jetbrains.com/issue/KT-76394/kotlin.time.TimeSource.asClock-missing>