Remove Gson, Jackson and Everit JSON Schema Validation code dependencies

[poikilotherm]

A lot of places in the code base use the Gson or Jackson library to do JSON processing (and a bit of data binding).

These should be refactored to use Java EE JSON-P (around since EE7) and JSON-B instead, making the code base using more standards and lowering no of deps.

This is related to #4260

[pdurbin]

Related: Increasingly slow feedback loop for developers, increasingly large WAR files #5593

[poikilotherm]

Lately, I came back to look into #6694 now that we are on Payara 5 and can use Jakarta JSON-B standard now. This issue should be done before.

This refactoring should cleanup the direct dependency on org.everit.json.schema, too. A good replacement would be leadpony/justify, as it uses Jakarta EE APIs only and doesn't introduce the dependencies again transitively. The outdated libs where discussed in #7218/#7248, too.

Will adapt the title accordingly.