[1] Feat: Add context, settings, and JSON APIs

[redaranj]

Changes in this pull request

• Updates native library to v0.75.19.
• Adds new context and settings APIs from the underlying library
• Adds C2PAJson for centralized JSON serialization
• Adds SettingsValidator for validating C2PA settings

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 22.43437% with 325 lines in your changes missing coverage. Please review.
✅ Project coverage is 53.15%. Comparing base (16dcd0b) to head (f43629c).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...org/contentauth/c2pa/manifest/SettingsValidator.kt	0.00%	278 Missing ⚠️
...ary/src/main/kotlin/org/contentauth/c2pa/Stream.kt	55.55%	8 Missing and 4 partials ⚠️
...ary/src/main/kotlin/org/contentauth/c2pa/Reader.kt	37.50%	8 Missing and 2 partials ⚠️
...ry/src/main/kotlin/org/contentauth/c2pa/Builder.kt	80.85%	5 Missing and 4 partials ⚠️
.../org/contentauth/c2pa/manifest/ValidationResult.kt	0.00%	7 Missing ⚠️
...c/main/kotlin/org/contentauth/c2pa/C2PASettings.kt	66.66%	2 Missing and 4 partials ⚠️
...rc/main/kotlin/org/contentauth/c2pa/C2PAContext.kt	78.57%	0 Missing and 3 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main      #47      +/-   ##
============================================
- Coverage     59.82%   53.15%   -6.67%     
  Complexity        9        9              
============================================
  Files            52       57       +5     
  Lines          1558     1936     +378     
  Branches        162      267     +105     
============================================
+ Hits            932     1029      +97     
- Misses          526      790     +264     
- Partials        100      117      +17     

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