Add uptime command

[itsTheFae]

• [x] I have tested my changes against the dev branch (the latest developmental version), and this pull request is targeting that branch as a base
• [x] I have tested my changes on Python 3.10 or higher
• [x] I have ensured my code is formatted using Black

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Description

Adds user-requested uptime command for displaying bot uptime remotely. As the bot measures its uptime by storing a starting time stamp, the time given by uptime may not match the time shown by a system-level service / process manager.

[BabyBoySnow]

which issue # if you have it

[itsTheFae]

This was requested in the discord by user currently named Uira

[itsTheFae]

I think this got broken when you resolved it.

[BabyBoySnow]

that's what I get for using the resolver on the webpage should've done it from vsc lol