Add utility to build all attack tests.

[puhley]

Changes in this pull request

Generating all of the variations of the attack files is tedious by hand. This script can be used to generate most of them using a single command. This will make it easier for new users of c2pa-attacks. In addition, debugging output can be produced when using this script for testing new functionality in the main binary.

Checklist

• This PR represents a single feature, fix, or change.
• All applicable changes have been documented.
• Any TO DO items (or similar) have been entered as GitHub issues and the link to that issue has been included in a comment.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (b96c6e3) 68.33% compared to head (793e19d) 68.33%.

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Additional details and impacted files

@@           Coverage Diff           @@
##             main     #106   +/-   ##
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  Coverage   68.33%   68.33%           
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  Files           2        2           
  Lines         499      499           
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  Hits          341      341           
  Misses        158      158           

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