feat: add option to remove video source on destroy

- Introduced a new static property REMOVE_SRC_WHEN_DESTROY in Artplayer to control whether the video source should be removed when the player is destroyed.
- Updated the destroy method in Artplayer to conditionally remove the video source based on the new property.
- Removed the line that sets the video source to an empty string in the Template class's destroy method, as this is now handled in Artplayer.
- Updated TypeScript definitions to include the new REMOVE_SRC_WHEN_DESTROY property.

packages/artplayer/types/artplayer.d.ts

@@ -86,6 +86,7 @@ export default class Artplayer extends Player {
   static FULLSCREEN_WEB_IN_BODY: boolean
   static LOG_VERSION: boolean
   static USE_RAF: boolean
+  static REMOVE_SRC_WHEN_DESTROY: boolean
 
   readonly id: number
   readonly option: Option