Add args to the error PDF-UA/2 8.2.5.20-2

[Vladimir-Burshnev]

Closes: https://trello.com/c/ANfMFlsv
FE PR: https://github.com/duallab/pdf4wcag-webapp-gui/pull/258
Profiles PR: veraPDF/veraPDF-validation-profiles#460
Validation PR: veraPDF/veraPDF-validation#737

Summary by CodeRabbit

• New Features
  • Added support for storing destination keys for links targeting structure elements.
  • Improved link metadata for destinations located elsewhere within the same structure element.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 61394caf-97ff-4730-b6b3-b9a2c227c867

📥 Commits

Reviewing files that changed from the base of the PR and between ea60267 and 12021aa.

📒 Files selected for processing (1)

• src/main/java/PDLayer.mdl

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📝 Walkthrough

Walkthrough

PDLinkAnnot gains two string properties for structure-related link destination keys, and the documentation for differentTargetAnnotObjectKey is broadened.

Changes

PDLinkAnnot schema

Layer / File(s)	Summary
Structure destination key properties src/main/java/PDLayer.mdl	Adds structDestinationKey and differentTargetAnnotDestinationKey to PDLinkAnnot, and updates the related field documentation.

Estimated code review effort: 1 (Trivial) | ~2 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title matches the main change: adding arguments to the PDF/UA-2 8.2.5.20-2 error.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch add-args-to-8.2.5.20-2

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