Move StatusValue.Events to an enum class

[ianwallen]

Move StatusValue.Events to an enum class
Identified the media type that is being stored in the database.
Instead of detecting if data is json or xml, instead base it on the media type for the event.

This is mostly a refactoring the code.

This is an enhancement on the changes from #8579

Checklist

• I have read the contribution guidelines
• Pull request provided for main branch, backports managed with label
• Good housekeeping of code, cleaning up comments, tests, and documentation
• Clean commit history broken into understandable chucks, avoiding big commits with hundreds of files, cautious of reformatting and whitespace changes
• Clean commit messages, longer verbose messages are encouraged
• API Changes are identified in commit messages
• Testing provided for features or enhancements using automatic tests
• User documentation provided for new features or enhancements in manual
• Build documentation provided for development instructions in README.md files
• Library management using pom.xml dependency management. Update build documentation with intended library use and library tutorials or documentation

[josegar74]

Code changes looks good.

@ianwallen would you mind to update the pull request to remove these unused imports from MetadataWorkflowApi?

import org.json.JSONException;
import org.json.JSONObject;