Use safe keyword when hook target namspace clashes with reserved java keywords (#426)

Author: Brianwithay21

python/rpdk/java/codegen.py

@@ -635,7 +635,7 @@ def generate_hook(self, src, project):  # pylint: disable=too-many-statements
             target_schema = target_info["Schema"]
 
             target_namespace = [
-                s.lower() for s in target_type_name.split("::")
+                safe_reserved(s.lower()) for s in target_type_name.split("::")
             ]  # AWS::SQS::Queue -> awssqsqueue
             target_name = "".join(
                 [s.capitalize() for s in target_namespace]