Create /mix group command

[Wikijito7]

Plays a mix generated from the given search or url. It will work exactly like current implementation in Python with the improvements on play command.

(?) Being able to stop this proccess.
(?) Mix with other services, such as Spotify

• Implement youtube mix
• Implement youtube music mix
• Implement souncloud mix

[Wikijito7]

This command needs to be created with ChatInputCommand.

bot.createGlobalChatInputCommand("", "") {
    
}