Add a 'remind me' command

[Daste745]

• Message - any message the user wants
• Date and/or time
  • Relative - 'in 5 minutes', 'in 2 hours', 'in 10m', 'in 1 month'
  • Absolute - '10th December', '10-11', '10-11-2022'
  • Natural (maybe) - 'next Sunday', 'tomorrow', 'next week'

More advanced features:

• Repeating reminders
  • Frequency - 'every day', 'every week', 'every Saturday', 'every 2 days'
  • Start (if frequency is selected, else take the current date)
  • End (if frequency is selected, else repeat indefinitely)