Simplify formatting for voice channel logs

[vcarl]

[what-the-diff]

PR Summary

• Introduction of Schedule Task Function
  The code update in src/features/voice-activity.ts imports a new function scheduleTask which is utilized for task scheduling.

• Parameters Update in Voice Activity Function
  The function voiceActivity within our voice-activity.ts module now requires an extra parameter, bot. This allows the function to increase its efficiency by scheduling tasks and handling voiceStateUpdate events directly.

• Movement of Voice State Update Event Handling
  The management of voiceStateUpdate events is now taken care of directly within the voiceActivity function in src/features/voice-activity.ts. This function now also keeps a log when someone joins or leaves a voice channel, which will benefit us by increasing the system's visibility on user voice channel activities.

• Import of Voice Activity Module
  VoiceActivity module is being imported into our main application file (src/index.ts). The significance of this is that it allows us to adopt the new functionalities within our main application.

• Deployment of Voice Activity Function
  The voiceActivity function is executed within the src/index.ts file with the bot as its input parameter. This means our 'bot' is now utilizing the enhanced functionalities that the voiceActivity function offers.

• Removal of Handle Voice State Update Function
  Finally, synchronizing with the move of voiceStateUpdate event handling, the older handleVoiceStateUpdate function was eliminated from src/index.ts. This move simplifies our code and reduces potential redundancy.

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