[Feature Request] Add Support For Multiple "AltPrefixes"

Nobody has claimed this yet.

### Is your feature request related to a problem? Please describe.

I wanna have more than 3 prefixes for my server to use.

### What is your ideal solution to the problem?

make `altprefix` an array list

### How would this feature be used?

Maybe I have `!` and `music!`, but I _also_ wanna use a dot and a bracket instead of just an exclamation mark,
so I edit the config file, and put all the prefixes I'd like to use in a list of alternative prefixes.

### Additional Info

_No response_

### Checklist

- [X] I have checked [the documentation](https://jmusicbot.com/) to make sure this feature doesn't already exist
- [X] I have searched for [similar feature requests](https://github.com/jagrosh/MusicBot/labels/enhancement)
- [X] I have confirmed that my requests is **not** on the [list of things that will not be added](https://jmusicbot.com/things-that-wont-be-added)
- [X] I am running the latest version of the bot: 

Start by locating the configuration handling for `altprefix` and the command-parsing entry point that currently limits prefixes. Trace how values from the config file are loaded and matched, then verify that multiple configured prefixes work for commands without breaking existing configurations.

Written by the indexing model from the issue text.