Add trust and verification options to c2pa_tool

[mauricefisher64]

Changes in this pull request

This PR adds support to configure trust features including trust anchors, allowed lists, trust store configuration and verification options.

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

Attention: Patch coverage is 40.00000% with 30 lines in your changes are missing coverage. Please review.

Project coverage is 76.10%. Comparing base (3d34beb) to head (2eff902).

Files	Patch %	Lines
src/main.rs	40.00%	30 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #168      +/-   ##
==========================================
- Coverage   83.95%   76.10%   -7.85%     
==========================================
  Files           3        3              
  Lines         374      406      +32     
==========================================
- Hits          314      309       -5     
- Misses         60       97      +37     

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[crandmck]

I suggested some minor edits to the README.

Also, the example files are missing:

• sample/trust_anchors.pem
• sample/allowed_list.pem
• sample/store.cfg

[crandmck]

Also @mauricefisher64 we should update the Usage section to add the new trust sub-command and options. I'd probably just mention them in the main section and tnen link down to the new section for details. I can edit the README directly in your branch if you want me to do that.

DONE

[dyro]

Looks clean 👍