refactor: move most player-related method into LavaPlayer class and various code refactors

[Nat1anWasTaken]

Description:

This pull request introduces a comprehensive refactor of the player module in the Lava project. Major changes include:

1. Refactoring of Various Methods: Methods have been consolidated and improved within the LavaPlayer class to enhance readability and maintainability.
2. Enhanced Event Handling and State Updates: The event handling logic and state management in player.py have been streamlined.
3. Bug Fixes: Fixed issues where no message update was triggered in the player display and addressed attribute errors when the player instance is None.
4. Code Cleanup: Removed unnecessary code and variables related to the autoplay feature, and applied early returns to simplify logic.
5. Project Structure Refinement: Renamed directories and updated all relevant code references for clearer structure.

These changes aim to improve the efficiency and clarity of the player module, ensuring a more robust and easier-to-maintain codebase.

Description generated by GPT-4

[deepsource-io[bot]]

Here's the code health analysis summary for commits 70810fa..2340df5. View details on DeepSource ↗.

Analysis Summary

Analyzer	Status	Summary	Link
Python	✅ Success	❗ 10 occurences introduced 🎯 10 occurences resolved	View Check ↗

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