[Feature Request] Allowing unix-style pattern matching in download_data.py

[xhluca]

Right now, you need to enter the exact name of each file required, which is quite time consuming. It would be nice to allow more flexibility in using python data/download_data.py. For example, the --resource flag could accept unix-style pattern matching, e.g.

# Download all file starting with data.retriever
python data/download_data.py --resource "data.retriever.*" 

# Download dev splits of retriever
python data/download_data.py --resource "data.retriever.*-dev" 

# Download all data
python data/download_data.py --resource "data.*" 

This can be easily done with fnmatch. I have personally implemented that and I'm happy to open a PR if it's welcomed