KAFKA-7043: Modified plugin isolation whitelist with recently added converters (KIP-305)

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

connect/runtime/src/main/java/org/apache/kafka/connect/runtime/isolation/PluginUtils.java

@@ -127,6 +127,11 @@ public class PluginUtils {
             + "|json\\..*"
             + "|file\\..*"
             + "|converters\\..*"
+            + "|storage\\.DoubleConverter"
+            + "|storage\\.FloatConverter"
+            + "|storage\\.IntegerConverter"
+            + "|storage\\.LongConverter"
+            + "|storage\\.ShortConverter"
             + "|storage\\.StringConverter"
             + "|rest\\.basic\\.auth\\.extension\\.BasicAuthSecurityRestExtension"
             + ")"

connect/runtime/src/test/java/org/apache/kafka/connect/runtime/isolation/PluginUtilsTest.java

@@ -146,6 +146,21 @@ public class PluginUtilsTest {
         assertTrue(PluginUtils.shouldLoadInIsolation(
                 "org.apache.kafka.connect.converters.ByteArrayConverter")
         );
+        assertTrue(PluginUtils.shouldLoadInIsolation(
+                "org.apache.kafka.connect.storage.DoubleConverter")
+        );
+        assertTrue(PluginUtils.shouldLoadInIsolation(
+                "org.apache.kafka.connect.storage.FloatConverter")
+        );
+        assertTrue(PluginUtils.shouldLoadInIsolation(
+                "org.apache.kafka.connect.storage.IntegerConverter")
+        );
+        assertTrue(PluginUtils.shouldLoadInIsolation(
+                "org.apache.kafka.connect.storage.LongConverter")
+        );
+        assertTrue(PluginUtils.shouldLoadInIsolation(
+                "org.apache.kafka.connect.storage.ShortConverter")
+        );
         assertTrue(PluginUtils.shouldLoadInIsolation(
                 "org.apache.kafka.connect.storage.StringConverter")
         );