Feature: Discord

[alexzedim]

Improve Discord bot with Discord.js v13.1 and implement new slash command for Initiative Bot

• character
• guild
• whoami
• log
• search
• voice
• realm

Links:

• Slash Commands Support discordjs/discord.js#5103
• https://blog.discord.com/slash-commands-are-here-8db0a385d9e6?gi=a1fe53680feb
• https://stackoverflow.com/questions/65402187/new-discord-slash-commands