Make dispatcherToBlockOn dispatcher based on daemon threads. (#814)
After https://github.com/JetBrains/skiko/pull/798, we changed Dispatcher.IO to custom dispatcher.
Dispatcher.IO is based on daemon threads (thread that receives InterruptException on application exit).
Our new dispatcher isn't. The proof:
```
import java.util.concurrent.Executors
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.asCoroutineDispatcher
import kotlinx.coroutines.runBlocking
fun main() {
runBlocking(Dispatchers.IO) {
println(Thread.currentThread().isDaemon) // prints true
}
runBlocking(Executors.newCachedThreadPool().asCoroutineDispatcher()) {
println(Thread.currentThread().isDaemon) // prints false
}
val defaultFactory = Executors.defaultThreadFactory()
runBlocking(Executors.newCachedThreadPool {
defaultFactory.newThread(it).apply {
isDaemon = true
}
}.asCoroutineDispatcher()) {
println(Thread.currentThread().isDaemon) // prints true
}
}
```
This PR makes threads daemon.
Reported in [Kotlin Slack](https://kotlinlang.slack.com/archives/C01D6HTPATV/p1697400320739369) - applications exits too long.
