Nushell wrapper for the Discord REST API

• discord app command create -- create global application command
  • helpers for defining command options:
    • discord app command option int
    • discord app command option string
• discord app command list -- get global application commands
• discord app get -- get current application

• discord channel message create -- channel message create
• discord channel message list -- get channel messages
• discord channel modify -- channel modify
• discord channel thread create -- channel thread create
• discord channel thread join -- channel thread join
• discord channel typing trigger -- trigger typing indicator

• discord guild channel list -- list guild channels

• discord interaction response -- create interaction response