refactor: update import statements to use .js extensions

- Changed all import statements across the project to include the .js extension for consistency and to comply with ES module standards.
- Updated imports in various files including bootstrap.ts, shutdown.ts, config.ts, and many others.
- Ensured that all related modules and types are correctly imported with the new extension.

src/player.ts

@@ -11,7 +11,7 @@ import {
 import type {
   DiscordPlayerOwner,
   DiscordPlayOptions,
-} from "./media/mediaTypes";
+} from "./media/mediaTypes.js";
 
 export class DiscordPlayer {
   private player: AudioPlayer;