17 improve analysis performance 1

[ack2406]

• Simplified the workflow by consolidating processes into two main scripts:

  1. download_data.py: Handles downloading and extracting datasets from Common Voice.
  2. extract_features.py: Responsible for extracting features from the preprocessed data.

• Removed redundant scripts for improved performance and maintainability.

• Added new feature extractors:

  • HarmonicNoiseRatioExtractor
  • SpectralCentroidExtractor
  • SpectralBandwidthExtractor
  • SpectralFlatnessExtractor
  • SpectralContrastExtractor
  • ChromaExtractor
  • ZeroCrossingExtractor

• Updated Makefile to reflect the changes:

  • Introduced a new download_and_extract command to streamline data downloading and feature extraction in one step.
  • Added list-features to display available feature extractors.

• Improved README.md with updated usage instructions and examples.