IssueTracker

Essentially a version of https://kotlin.github.io/kotlinx.coroutines/kotlinx-coroutines-guava/kotlinx.coroutines.guava/future.html that depends on android.concurrent instead of Guava.

Example from a KTX style helper for Wear Tiles, which has ListenableFuture as it's API.

This implementation uses https://cs.android.com/androidx/platform/frameworks/support/+/androidx-main:concurrent/concurrent-futures/src/main/java/androidx/concurrent/futures/CallbackToFutureAdapter.java

```
    final override fun onTileRequest(
        requestParams: TileRequest
    ): ListenableFuture<Tile> {
        return CallbackToFutureAdapter.getFuture { completer ->
            val job = lifecycleScope.launch {
                try {
                    completer.set(tileRequest(requestParams))
                } catch (e: Exception) {
                    completer.setException(e)
                }
            }

            completer.addCancellationListener({ job.cancel() }, Runnable::run)

            "Tile Service Function"
        }
    }
```

This is essentially the topic discussed here https://github.com/Kotlin/kotlinx.coroutines/issues/1552