Add more fields to punishment embeds (length, relative expiry, relative issued at)

[TBG1000]

Issues:

• Current "New punishment" embeds generated by the punishment webhook do not display the length of a punishment (i.e will display that it's a mute, but not that it's for 2 hours).

• Relative expiry of the punishment is also a convenient feature to have. This idea is taken from this TODO in the code.

• Relative "issued at" field, taken from this TODO

Current embed:

Desired solutions:

• Display the punishment length. To the right of "Reason" could be a suitable spot.
• Display the relative expiry. Discord's integrated timestamps could be used to do so. It could be labeled as "Expires in" with a timestamp below it saying something along the lines of "2 days 3 hours 4 minutes"
• Display a relative "Issued at" field. For example, "Issued: 2 hours 1 minute ago"

Affected areas / files

• Webhook util