Feat: Small Builder/Reader capability additions

[redaranj]

Changes in this pull request

Adds three small Builder/Reader capabilities:

• Builder.setBasePath (resolve relative resource references against a directory)
• Builder/Reader.supportedMimeTypes introspection
• Ingredient archive import/export

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 60.00000% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 71.96%. Comparing base (5d4838e) to head (da485ee).

Files with missing lines	Patch %	Lines
...ry/src/main/kotlin/org/contentauth/c2pa/Builder.kt	61.53%	1 Missing and 4 partials ⚠️
...ary/src/main/kotlin/org/contentauth/c2pa/Reader.kt	50.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main      #99      +/-   ##
============================================
- Coverage     72.04%   71.96%   -0.09%     
- Complexity      267      272       +5     
============================================
  Files            59       59              
  Lines          2214     2229      +15     
  Branches        243      249       +6     
============================================
+ Hits           1595     1604       +9     
- Misses          482      483       +1     
- Partials        137      142       +5     

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.