Sof-utils

Added

- `sof-convert-tfds` now included `image/upside_down` labels

Fixed

- Fixed: `sof-convert-tfds` ignores class labels.

Added
- `sof-convert-labels` can now handle multiple input files

Fixed

- pypi package badge

Added

- pypi package badge

Added

- `sof-convert-tfds` tool to convert the TFDS dataset to other formats.

Changed

- Adapted `sof-convert-labels` tool to new LabelStudio label format (including key points).