Expand async usage possibility

[cedricwritescode]

Is your feature request related to a problem? Please describe. When starting a movement, it will get executed asynchronously (using the gptimer ISR). To check that the movement is completed, however, you need to poll the status.

Describe the solution you'd like The library should tell the main program that the motor movement finished, by means of a callback of some sorts. Maybe the esp_event library could be used.

Describe alternatives you've considered FreeRTOS constructs could be used as well, like binary Semaphores, queues or task notifications.

Additional context

[cedricwritescode]

This issue needs to be fixed for this enhancement.

[dolfelt]

Are there any updates on this? I am trying to get feedback from a motor movement from one ESP32 running the motor, to another ESP32 running an LCD touchscreen.

[cedricwritescode]

Together with @eldendiss I tried improving the architecture (#22). I think, however, nothing in the async direction was actually implemented. Currently I'm quite busy with other stuff so maybe he can help out, or just fork this library :)