Add protobuf collections as safe ones (#7438)

protobuf collections used are specific ones implementing JDK
interfaces. They are in-memory collection so it is safe to handle them
like the JDK ones.

Author: jpbempel

dd-java-agent/agent-debugger/debugger-bootstrap/src/main/java/datadog/trace/bootstrap/debugger/util/WellKnownClasses.java

@@ -160,6 +160,10 @@ public static boolean isSafe(Collection<?> collection) {
       // All Collection implementations from JDK base module are considered as safe
       return true;
     }
+    if (className.startsWith("com.google.protobuf.")) {
+      // All Collection implementations from Google ProtoBuf are considered as safe
+      return true;
+    }
     return false;
   }
 
@@ -170,6 +174,10 @@ public static boolean isSafe(Map<?, ?> map) {
       // All Map implementations from JDK base module are considered as safe
       return true;
     }
+    if (className.startsWith("com.google.protobuf.")) {
+      // All Map implementations from Google ProtoBuf are considered as safe
+      return true;
+    }
     return false;
   }