Updated manifest helper classes to C2PA spec version 2.3.

[tladesignz]

Changes in this pull request

C2PA spec version 2.3 added some ValidationStatusCodes, StandardAssertionLabels and PredefinedActions. This PR adds these.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• 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]

Codecov Report

❌ Patch coverage is 44.44444% with 10 lines in your changes missing coverage. Please review.
✅ Project coverage is 76.64%. Comparing base (a69c193) to head (20b7422).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
Library/Sources/Manifest/AssertionDefinition.swift	44.44%	10 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main      #84       +/-   ##
===========================================
+ Coverage   54.26%   76.64%   +22.38%     
===========================================
  Files          39       39               
  Lines        1301     1319       +18     
===========================================
+ Hits          706     1011      +305     
+ Misses        595      308      -287     

Flag	Coverage Δ
unittests	76.64% <44.44%> (+22.38%)	⬆️

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