Add chardet as a dependency in requirements.txt?

[GenevieveBuckley]

I think chardet needs to be added to the requirements.txt. It's used in utils/metadata.py, and I get an import error in the first cell of the DaskFustion_Example.ipynb notebook if chardet is not installed.

To reproduce:

1. Create a new python environment with the dependencies from

conda create -n daskfusion python=3.9 pip -y
conda activate daskfusion
python -m pip install -r requirements.txt

2. Run the first cell of the DaskFusion_Example.ipynb notebook (or import utils.metadata)

---------------------------------------------------------------------------
ModuleNotFoundError                       Traceback (most recent call last)
/tmp/ipykernel_77756/2037699358.py in <module>
     12 from fuse.fuse import fuse_func
     13 from utils.download_sample import download_from_dropbox
---> 14 from utils.metadata import extract_coordinates, normalize_coords_to_pixel
     15 from utils.imutils import crop_black_border, load_image, transpose
     16 from utils.shapely_and_napari_utils import get_transformed_array_corners, numpy_shape_to_shapely

~/GitHub/DaskFusion/utils/metadata.py in <module>
      4 from typing import Tuple, Union
      5 
----> 6 import chardet
      7 import pandas as pd
      8 

ModuleNotFoundError: No module named 'chardet'