Apache Superset 4.x support

[donhardman]

Proposal:

Currently, we support Apache Superset 3.x, but version 4.x is now available on the market. We should validate our existing support and implement any missing handlers to fully support the new version.

Checklist:

^{To be completed by the assignee. Check off tasks that have been completed or are not applicable.}

• Implementation completed
• Tests developed
• Documentation updated
• Documentation reviewed
• Changelog updated
• OpenAPI YAML updated and issue created to rebuild clients

[sanikolaev]

As discussed, it's hard to estimate how long it will take to fix it.