Add an option to keep images with no annotation

[HonzaCuhel]

This PR includes:

• Removing "empty images" (images without any annotation) by default
• Added ---keep-empty-images flag to disable the removing
• Added warning about presence of empty images for dataset formats
• Added logging about removal of empty images
• Added type annotations to some of the classes in the utils folder
• Updated docs

[klemen1999]

LGTM

[github-actions]

☂️ Python Coverage

current status: ✅

Overall Coverage

Lines	Covered	Coverage	Threshold	Status
1693	1069	63%	0%	🟢

New Files

No new covered files...

Modified Files

File	Coverage	Status
datadreamer/dataset_annotation/slimsam_annotator.py	82%	🟢
datadreamer/pipelines/generate_dataset_from_scratch.py	38%	🟢
datadreamer/utils/base_converter.py	96%	🟢
datadreamer/utils/coco_converter.py	90%	🟢
datadreamer/utils/config.py	100%	🟢
datadreamer/utils/convert_dataset.py	23%	🟢
datadreamer/utils/luxonis_dataset_converter.py	73%	🟢
datadreamer/utils/single_label_cls_converter.py	97%	🟢
datadreamer/utils/yolo_converter.py	79%	🟢
TOTAL	75%	🟢

updated for commit: e6653d9 by action🐍

[github-actions]

Test Results

  6 files    6 suites   1h 27m 0s ⏱️
 69 tests  55 ✅ 14 💤 0 ❌
414 runs  326 ✅ 88 💤 0 ❌

Results for commit e6653d9.