Several recently-added converters are included in the plugin isolation whitelist, similarly to the `StringConverter`. This is a change in the implementation, and does not affect the approved KIP. Several unit tests were added to verify they are being loaded in isolation, again similarly to `StringConverter`.
These changes should be applied only to `trunk` and `2.0`, since these converters were added as part of KIP-305 for AK 2.0.
Author: Randall Hauch <rhauch@gmail.com>
Reviewers: Magesh Nandakumar <magesh.n.kumar@gmail.com>, Konstantine Karantasis <konstantine@confluent.io>, Ewen Cheslack-Postava <ewen@confluent.io>
Closes#5198 from rhauch/kafka-7043