22.0.0 release adapter depercations

[mb-techno]

Hi, with the release of 22.0.0 some adapters have been deprecated again.
This is bad news, especially after earlier this year they where un-deprecated.

Currently we run a few barebones Jax-RS applications with the java servlet adapter.
And sadly there looks to be no functional alternative for us:
We don't use Spring, Wildfly, or Quarkus and Pac4j gives many dep issues plus, it's docs seem nowhere near correct.

I wonder what exactly is being deprecated, is the adapter-core package being deprecated too? Because then we might choose to make our own servlet package. But without that package that will be undoable.