Create a job execution script to execute Kolibri tasks in a WorkManager context

[rtibbles]

In order to allow our asynchronous tasks to be effectively run in the Android context, we will need to make a wrapper script that handles managing display of notifications in the case of a long running task, and of executing the job execution function with the appropriate job id passed in.

This script should access Android APIs via pyjnius in order to get the job_id information that needs to be passed as part of the WorkManager data: https://developer.android.com/topic/libraries/architecture/workmanager