Add support for Moodle Content Bank (`core_contentbank`)

[erseco]

It would be very useful if this plugin supported integration with the Moodle Content Bank subsystem, allowing SCORM packages generated or managed by mod_exescorm to be stored and reused directly from the content bank interface.

This would provide several benefits:

• Centralized management of SCORM content across multiple courses.
• Reusability of eXeLearning packages without duplication.
• Possibility to edit or update packages while keeping references consistent.

Suggested approach:

Implement a new contenttype plugin (e.g., contenttype_exescorm) that:

• Accepts .zip files with SCORM content.
• Parses basic metadata (e.g., imsmanifest.xml).
• Provides a method to insert or associate a package with a course activity (mod_exescorm).
• Optionally links back to the editing experience via the configured exeonlinebaseuri.

See Moodle developer documentation for details:

• Content bank subsystem: https://moodle.atlassian.net/browse/MDL-67786
• Creating a contenttype plugin: https://github.com/moodle/moodle/tree/main/contentbank/
• Example plugin (contenttype_h5p): https://github.com/moodle/moodle/tree/main/contentbank/contenttype/h5p

Let me know if this idea aligns with the roadmap, or if you would consider a PR on this.

Thanks for your work on this module!