Update voice bot functionality and clean up project structure

- Added voice message handling capabilities, including saving and deleting audio messages via callback queries.
- Refactored audio record management in the database to remove unnecessary fields and streamline operations.
- Introduced new keyboard options for voice interactions in the bot.
- Updated `.gitignore` to include voice user files for better project organization.
- Removed obsolete voice bot handler files to simplify the codebase.

helper_bot/handlers/voice/__init__.py

@@ -0,0 +1,3 @@
+from .voice_handler import VoiceHandlers
+
+__all__ = ["VoiceHandlers"]