Enable LOM metadata support for Learning Sequences

[kevenClausenKPG]

This PR completes Learning Object Metadata (LOM) support for the Learning Sequence following components/ILIAS/MetaData/docs/enabling_lom.md.

It includes:

• Lifecycle wiring: call createMetaData(), updateMetaData(), and deleteMetaData() in the LSO object lifecycle
• UI: always expose the Meta Data tab via ilObjectMetaDataGUI::getTab() (no CUSTOM_METADATA gating) and show LOM sections on the info screen via addMetaDataSections(..., 0, 'lso')
• Import/Export: add importer mapping for components/ILIAS/MetaData (md) so LOM sets are correctly remapped on import
• Setup: add a migration to initialize LOM sets for pre-existing Learning Sequences

https://docu.ilias.de/go/wiki/wpage_7807_1357

[kevenClausenKPG]

Hey @schmitz-ilias , could you please take a look at my metadata implementation for the LSO and give me some feedback?

[schmitz-ilias]

Hi @kevenClausenKPG,

everything related to Metadata looks good all in all, just a few points:

• The new InitLOMForLearningSequenceMigration needs to be added to ilLearningSequenceSetupAgent::getMigrations, otherwise it will not be shown.
• It's a bit strange that there is no LuceneObjectDefinition.xml for Learning Sequences at all, I guess Lucene support for the object was just never implemented. Maybe a small project for another day ^^
• AdvancedMetaData also needs to be added as a tail dependency in ilLearningSequenceExporter (similar to LOM), see for an example ilGroupExporter.
• Unrelated to Metadata: I haven't looked at this too deeply, but the changes in ilObjLearningSequenceSettingsGUI::update look fishy to me. It seems like the form input related to title, description, and online-status will not be processed anymore?

Note that Taxonomies are currently mostly independent of MetaData, so I can't review that part of the implementation. Let me know if anything is unclear!

Cheers, Tim