Add config file for better command aliases

[Machine-Maker]

Adds a new file, command-aliases.yml into our config folder for defining simple aliases for commands that work with tab completion and permissions. Schema is as follows

alias1: some-command

alias2:
  - some
  - command

alias3:
  target: some-command
  permission: some.permission

alias4:
  target:
    - some
    - command
  permission: some.permission

The default permission behavior is to combine all of the permission requirements at all of the nodes along the target path and assign that to the alias node. But that can be changed to a custom permission in the config.

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Closes #9214
Related #9458

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Will be merged into the paper config patch just before merging.

[YanisBft]

Great work, will be very helpful! Do you plan on deprecating Bukkit command aliases? Or still support it officially

[Machine-Maker]

Do you plan on deprecating Bukkit command aliases?

I don't think we have to, its pretty barebones as-is, and just won't get updates (like it hasn't gotten updates in years anyways).

[Huge-mistake]

Bump, is there still a chance to merge this PR? (╯°□°）