Extract AbstractApiUtils static methods into lib/utils/ individual files

[taylortom]

Summary

Extract all pure static methods from AbstractApiUtils into individual files under lib/utils/.

Functions to extract

• httpMethodToAction(method) — pure mapping: HTTP verb to auth action
• httpMethodToDBFunction(method) — pure mapping: HTTP verb to DB operation
• argsFromReq(req) — pure extraction: builds MongoDB args from Express request
• generateApiMetadata(instance) — generates OpenAPI-style metadata for routes
• stringifyValues(data) — pure recursive: converts Dates/ObjectIds to strings

Additional changes

• Bump adapt-authoring-core dependency to ^2.0.0
• Keep deprecated delegation stubs on AbstractApiUtils for backwards compatibility
• Add tests/utils-*.spec.js for each extracted utility

[github-actions]

🎉 This issue has been resolved in version 2.0.0 🎉

The release is available on:

• GitHub release
• npm package (@latest dist-tag)

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