Create a MixedCommand class

[moonstar-x]

⚡ Describe the New Feature

A MixedCommand class that can represent either a RegularCommand or SlashCommand, allowing for usage of the same command but with both command methods.

A CommandRequest class would also need to be made to represent the MixedCommand's trigger. This class would contain references to the underlying message or interaction but would also contain the common properties and methods that both objects share.