[2] feat: Signer settings and CAWG signing

[redaranj]

Changes in this pull request

Adds support for creating a signer from JSON and TOML settings. Also adds support for CAWG signing via settings.

Intended to be merged after #16.

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 4.60526% with 145 lines in your changes missing coverage. Please review.
✅ Project coverage is 44.46%. Comparing base (74da197) to head (adbdb5b).

Files with missing lines	Patch %	Lines
...ary/src/main/kotlin/org/contentauth/c2pa/Action.kt	0.00%	51 Missing ⚠️
...ary/src/main/kotlin/org/contentauth/c2pa/Intent.kt	0.00%	49 Missing ⚠️
...in/kotlin/org/contentauth/c2pa/PredefinedAction.kt	0.00%	27 Missing ⚠️
...ry/src/main/kotlin/org/contentauth/c2pa/Builder.kt	0.00%	6 Missing ⚠️
...ary/src/main/kotlin/org/contentauth/c2pa/Reader.kt	0.00%	6 Missing ⚠️
...ary/src/main/kotlin/org/contentauth/c2pa/Signer.kt	50.00%	4 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #17      +/-   ##
==========================================
- Coverage   52.07%   44.46%   -7.61%     
==========================================
  Files          13       16       +3     
  Lines         797      949     +152     
  Branches      116      135      +19     
==========================================
+ Hits          415      422       +7     
- Misses        309      452     +143     
- Partials       73       75       +2     

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