feat: Add support for exporting a JPEG Trust Trust Indicator Set

[lrosenthol]

Changes in this pull request

Added a new JpegTrustReader that is API compatible with the standard Reader, but will output a JPEG Trust (ISO 21617-1) compatible Trust Indicator Set instead of the current c2pa-rs JSON structure.

Also added appropriate unit tests including limited "schema validation".

Various documentation on the work performed (by Cursor) is included as well, but could/should be removed at some point.

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.

[tmathern]

@lrosenthol I am changing the PR's title to follow conventional commits, to give the tests a chance to get to run + adding the safe to test label.
(I assume we want them to run even if the PR is a draft).

[codspeed-hq]

Merging this PR will not alter performance

✅ 16 untouched benchmarks
⏩ 2 skipped benchmarks¹

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_{Comparing jpeg-trust-manifests (e178886) with main (81033e0)}

Footnotes

1. 2 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

[tmathern]

(If you merge in latest main, the build issues will resolve)

[lrosenthol]

Pulled it in - thanks!!