[Enhancement:] Message timer expressions

[davidhozic]

Summary

Sometimes it is useful to create countdown reminders; e. g., "The session will begin in [4 hours]", "The session will begin in [2 hours]", et cetera.

This issue proposes two things:

• Timers inside messages, which can track elapsed time, as well as remaining time.
• Expressions inside text messages

Basic Example

Expression example:

Don't forget our session today, it is in {message.next_send_time - time("2024-11-24T16:00:00")}.

Above example has an expression wrapped inside the {} brackets. The expression would evaluate to the difference between the time the message is sent and the time specified in the ISO 8601 date & time format (time("2024-11-24T16:00:00").

Unresolved questions

No response