Add support for repetitive/recurring alarm

[tenzap]

Is your feature request related to a problem? Please describe.

I would like to be able to have repetitive/recurring alarm. For example, from 8.00 to 20.00 I would like to have an alarm ring every 30minutes. This would be the configuration of one alarm. Objective is to avoid having to set an alarm for each occurrence individually.

Describe the solution you'd like

See above

Use case

See above

Describe alternatives you've considered

This app supports it, but it's not open source AFAICT. https://play.google.com/store/apps/details?id=com.kittoboy.repeatalarm&hl=en_US

Its description says: Only four fields are required to set alarms!😁 ✓ Alarm Name ✓ Repeat Day ✓ Start and End Time ✓ Alarming Intervals

Additional context