Offer a custom entry in Calendar when setting reminders
- /e/ version: all
- Device model(s): all
## Description
Add a "Custom" entry in the list of available reminders when the user creates/edits an event. When the user selects this entry, they can type the number (integer between 1 and 99) and select the unit they want (minutes, hours, days).
## Mock-ups
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## Validation
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issue