feat(uptime): add uptime monitor with refreshes

Introduces an uptime command and view to show how long the bot has been running. Adds a method to calculate uptime in bot.py, registers the command in help.py, and implements the command logic in a new uptime.py cog with a refresh button.

cogs/general/help.py

@@ -41,6 +41,7 @@ class Help(commands.Cog, name="help"):
             "serverinfo": "general",
             "ping": "general",
             "feedback": "general",
+            "uptime": "general",
         #   "context_menus": "general",
         
             # Fun Commands