Production-grade stub of adb server

[Malinskiy]

For applications based on adam it is hard to write integration tests without real device or emulator right now.

To facilitate testing of tooling based on adam (and potentially plain adb access), a stub of adb server is needed.

Example syntax in mind:

val server = AndroidDebugBridgeServer(port = 1234).start()
...
server.expectPullFileRequest {
    respond(File("/tmp/x"))
}
server.expectTestRunnerRequest {
    respondTestStarted()
    delay(1000)
    respondTestFinished()
}