add agenda view

[eTomte]

I installed Reminder last week and am loving it! Thanks for writing this plugin! One less bit of information I have to entrust to Google. :)

I noticed that when I do a !remind list the results appear in the order in which they were added. Additionally, some of them show up with an exact date whereas others appear with a relative date. ie.,

Your upcoming reminders in this room:

"Renew Homeserver Certs!" at 09:00:04 CDT on Monday, April 10 2023
"Download Picard S03E04" at 09:00:36 CST on Thursday, March 9 2023
"read Matrix Live" in 6 days, 21 hours, 18 minutes and 43 seconds

It would be nice to have an additional "agenda" command where things were listed in chronological order by date/time:

!remind agenda

Your upcoming reminders in this room:

2023-03-03 12:00 "read Matrix Live"
2023-03-09 09:00 "Download Picard S03E04"
2023-04-10 09:00 "Renew Homeserver Certs!"

Thanks again!