feat: Add frontend components and configurations for step sequencer

Commit notes

This commit introduces a comprehensive set of new components and configurations for the step sequencer application. Key additions include the `StepSequencer`, `SequencerTrack`, and various control components such as `BpmControl`, `TransportControls`, and `StepButton`. Additionally, it establishes a new audio and sequencer store to manage state and functionality effectively. The layout and routing are updated to support the new structure, enhancing user interaction and overall experience within the application. This implementation lays the groundwork for a fully functional step sequencer.