alobugdays- dataset from directory

[Data-Iab]

General description of your pull request with the list of new features and/or bugs.

• New feature : TRT calibration dataset  #249 Dataset from directory iterator. Main use : calibrating TRT engines.

path1 = "PATH/TO/DIR/WITH/IMAGES1"
path2 = "PATH/TO/DIR/WITH/IMAGES2"

dataset = FromDirectoryDataset(dirs={"right": [path1, path1], "left": [path2, path2]}, slice=[0.2, 0.3])

# Will return dictionary  {"right": img1, "left": img2}
sample1 = dataset[0]

---

This pull request includes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update