Add `termux-job-scheduler`

[hugmouse]

API: no public API available

Description: Schedule a script to run at specified intervals.

Options:

  --pending                  list pending jobs and exit (default false)
  --cancel-all boolean       cancel all pending jobs and exit (default false)
  --cancel boolean           cancel given job-id and exit (default false)
Options for scheduling:
  --script text              path to the script to be called
  --job-id int               job id (will overwrite any previous job with the same id)
  --period-ms int            schedule job approximately every period-ms milliseconds (default 0 means once)
  --network text             run only when this type of network available, default none (any|unmetered|cellular|not_roaming|none)
  --battery-not-low boolean  run only when battery is not low, default true (at least Android O)
  --storage-not-low boolean  run only when storage is not low, default false (at least Android O)
  --charging boolean         run only when charging, default false
  --trigger-content-uri text (at least Android N)
  --trigger-content-flag int default 1, (at least Android N)