[feat req] support colon in file names

[erikmartino]

What would you like to be added?

The current implementation halts with an error if the file names contains a colon. I suggest to introduce a parameter to allow this. For example lowest_common_denomitator_filenames_enforced.

Why is this needed?

upload-artifact fails if your artifact happens to include file names with a colon, which is a perfectly valid file name character on most OS's.

[erikmartino]

Alternatively handle this functionality in download-artifact instead