Add voice activity tracking

[dylangarcia]

Does what it says on the box. It needs a new intent but afaict the bot itself doesn't need to be updated for that? Idk how intents work.

[what-the-diff]

PR Summary

• Introduction of Voice Activity Module
  A new file called voice-activity.ts has been added. This serves as a dedicated space for managing voice activities within Discord channels (like who is speaking or not).

• Inclusion of New Module to Channel Handlers
  The new voiceActivity module is now incorporated into our channel handlers, courtesy of modifications made in the index.ts file. With this change, the functionality of voice activity handling can be conveniently managed and accessed from the existing list of channel handlers.

• Addition of Listener for Voice State Updates
  With changes made to index.ts, we now have a new event listener for any updates in voice state, such as someone joining or leaving a voice channel. When these events occur, our system swiftly responds and executes the handleVoiceStateUpdate function to ensure proper adjustments are made accordingly.

• Introduction of New Type for Voice State Changes
  A new type HandleVoiceStateChangeArgs is now available in types/index.ts. This brings more clarity and type safety while working with voice state change events, making carrying out associated operations more reliable.

[ghost]

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[vcarl]

Nice, tested locally and it looks good