Add plugin suggestion commands

[kalilistic]

Few commands that might help with the plugin suggestions. Came up with some draft wording - if you agree on adding, feel free to adjust wordings or commands of course.

1. Duplicate Suggestion (f!pdupe)
   This looks like an existing suggestion. Be sure to add a 👍 (+1) to the issue on GitHub. This way developers will be able to see what plugins are the most desired. You can also add comments with ideas on how the plugin might work. You should be able to find the suggestion on the repo in the pins.

2. Duplicate Suggestion with Github Issue Link (f!pdupe githubIssueUrl)
   This looks like an existing suggestion. Be sure to add a 👍 (+1) to the issue on GitHub. This way developers will be able to see what plugins are the most desired. You can also add comments with ideas on how the plugin might work. [link to github issue].

3. Plugin against rules with link to rules README (f!prules)
   A plugin with this feature would not be allowed on the official plugin repo as it violates our rules. Please review #welcome.

4. Request would be better met with a mod (f!pmod)
   This suggestion would most likely be implemented with a mod rather than a plugin.

5. Request already exists with a plugin (f!pdone pluginName)
   This is already done - please check out [plugin name].

6. No ACT (f!pact)
   ACT is the defacto standard and the FFXIV parsing plugin is closed-source. We're not looking to reinvent the wheel and we don't want that attention either.

[kalilistic]

It'd be helpful if these could mention the user as well...I saw some commands did this. Since sometimes the suggestions chat can move quickly.

[reiichi001]

I'll look into adding these! I don't think any of my current commands mention a user (at least, none of the FAQ ones).

Given Discord's aggressiveness towards message-based commands, I may start off by making these slash commands. The bonus there is we can easily plug user mentions and optional arguments super easily.

[kalilistic]

Sounds good, let me know if need any help.