add --multi-file-regex option

[snoyer]

Describe your changes

add --multi-file-regex option allowing to use a regular expression to group files.
On matching file paths, captured groups are replaced with * so that, for example, with regex part(\d+):

• foo-part1.xyz and foo-part2.xyz become foo-part*.xyz and are grouped together
• bar-part1.xyz and bar-part2.xyz become bar-part*.xyz and are together in a separate group
• non-matching files would get grouped according to --multi-file-mode

Issue ticket number and link if any

#1654

Checklist for finalizing the PR

• I have performed a self-review of my code
• I have added tests for new features and bugfixes
• I have added documentation for new features
• If it is a modifying the libf3d API, I have updated bindings
• If it is a modifying the .github/workflows/versions.json, I have updated timestamp

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
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⚠️ Report is 8 commits behind head on master.

Additional details and impacted files

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  Hits              ?    11759           
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[mwestphal]

Do you need a review @snoyer ?