Implements command `/reload_all`

[kaelabook]

Description

This change makes it possible for dev members to reload all cogs instead of just one. I figured I would work on this because the issue was created way back in 2021. Works somewhat expected (reloads all cogs then goes jelly in the terminal). Please run and check that it works correctly!

~The exception it gives me is:~

~Command 'reload_all' raised an exception: InteractionResponded: This interaction has already been responded to before~

Works now! Thanks, @BPennie03!

Issues

Closes #24

Type of change

Select one or more of the following:

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] Other (describe below)

How Has This Been Tested?

• [ ] Run /reload_all
• [ ] Check to see if it prints out in terminal
• [ ] Check to see if bot prints it out in Discord

Checklist:

• [x] All local commits have been pushed to remote
• [x] All changes on the base branch have been merged into this branch, either by rebase or merge
• [x] My code is PEP-8 compliant (excluding maximum line length, keep that to 100ish characters)
• [x] I have performed a self-review of my own code
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] I have added Google Docstrings for all new functions/methods
• [x] I have made corresponding changes to the documentation

[kaelabook]

Should I change the command name to /update? Thoughts?