Implement Pitch Control Component and Integrate into Step Sequencer

Commit notes

This commit introduces a new PitchControl component for managing pitch adjustments in semitones. The component is integrated into the StepButton and StepControls components, replacing the previous input method for pitch changes. Additionally, the StepGrid component is updated to handle pitch changes for individual steps, enhancing the user experience in the sequencer. The changes streamline pitch management and improve the overall functionality of the sequencer.