Implement sequencer file generation and streaming functionality

Commit notes

This commit introduces several key features for handling sequencer files: - Added a new endpoint for streaming compressed Opus files for sequencer playback. - Updated the SamplePackHandler to include sequencer URLs in responses for sequencer requests. - Enhanced the Sample model to store the path for sequencer files. - Implemented logic for generating sequencer files during sample uploads and added a script to regenerate audio files. - Updated frontend components to utilize the new sequencer URL for improved audio playback experience.

These changes enhance the audio capabilities of the application, allowing for better integration with sequencer tools.