Add option to set alarm/reminder "during the day at hh:mm" for all-day tasks like already exists for all-day events

[upbox-org]

Checklist

• I made sure that there are no existing issues - open or closed - to which I could contribute my information.
• I have read the FAQ and my problem isn't listed.
• I have taken the time to fill in all the required details. I understand that the feature request will be dismissed otherwise.
• This issue contains only one feature request.
• I have read and understood the contribution guidelines.

Is your feature request related to a problem? Please describe.
I use both features, events and tasks. Sometimes I have full-day events and sometimes full-day tasks and in some cases I like to be remembered mid-day with an alarm. This works only for events atm. The option "during the day at hh:mm" exists only for events, not for tasks.

Describe the solution you'd like
Please add the same option which exists already for all-day events for full-day tasks alarms/reminders.

Describe alternatives you've considered
None, sorry.

Additional context