New: Add importProgressHook for import progress reporting

[taylortom]

New

• Add a generic, transport-agnostic importProgressHook to AdaptFrameworkModule, bridged from AdaptFrameworkImport (mirrors the existing preImportHook/postImportHook wiring).
• Emit progress during import:
  • a phase event ({ phase, step, totalSteps }) before each enabled phase in the import task loop, and
  • per-item events ({ phase, current, total }) within the heavy phases importCourseAssets and importCourseData.
• Thread an opaque importToken correlation id through POST /import → importCourse() → the importer (exposed as importer.importToken), so a consumer can attribute progress to a specific import (e.g. pick a websocket room). It has no meaning to the framework itself.
• Document the new seam in docs/building-courses.md.

The framework emits plain progress objects and depends on no particular delivery mechanism; relaying them (e.g. over a websocket) is left to consumer modules.

Testing

• npm test — all 38 tests pass.
• npx standard — clean.

[github-actions]

🎉 This PR is included in version 3.3.0 🎉

The release is available on:

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

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