Implement stripepy download

[robomics]

StripePy download is a new subcommand that aims to simplify downloading datasets that can be used to test StripePy.

Example usage:

# List the available datasets
stripepy download --list-only

# Randomly select and download one of the datasets
stripepy download

# Randomly select and download a dataset using --max-size as upper bound for the file size
stripepy download --max-size 512

# Override the output file location
stripepy download -o my_precious.hic

# Download the given dataset
stripepy download --name 4DNFIOTPSS3L

# Randomly select and download a dataset for the given reference genome
stripepy download --refrence-genome dm6