Add CLI tool for converting YOLO-format to MSCOCO

[zhiqwang]

python3 tools/convert_txt_to_json.py --data_source data-bin/coco128/
                                     --class_names notebooks/assets/coco.names
                                     --label_dir labels
                                     --image_dir images

[codecov]

Codecov Report

Merging #375 (0d9b329) into main (63ad69a) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #375   +/-   ##
=======================================
  Coverage   98.58%   98.58%           
=======================================
  Files          11       11           
  Lines         778      778           
=======================================
  Hits          767      767           
  Misses         11       11           

Flag	Coverage Δ
unittests	98.58% <ø> (ø)

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