OEMetaBuilder: bugfix and general enhancements

Description of the issue

Post release v1.2.0 OEMetadata specification was implemented in the OEMetaBuilder. The Builder also depends on the json schema, but it requires extra properties. Some of them are not native to the json schema spec and not related to the OEMetadata specification but relevant to the presentation and features like autocompletion and oeo term lookup.

The diff. between the json schema for specification and editing makes the process of adapting the editing schema to new metadata versions error-prone. In the long run we need a functionality that can automatically extend the metadata specification json schema with properties needed for the editor (OEMetaBuilder).

This issue is also for fixing some bugs that were introduced after migrating the builder to OEMetadata v2.0.4 - as described above.

Ideas of solution

Fix errors in OEMetaBuilder json schema file (in dataedit static assets):

• Fix wrong title
• missing oeo-extended feature

Long term:

• Add functionality to merge schema and additional properties needed for the OEMetaBuilder
• Button for oeo-extended
• Hooks for oeo-term lookup in annotation fields
• add annotation feature to more properties

Context and Environment

• Version used: v-1.2.0
• Operating system: Ubuntu
• Environment setup and (python) version: 3.10

Workflow checklist

• I am aware of the workflow in CONTRIBUTING.md