fix(protobuf): Use the current thread classloader when deserializing …

…to pojo.

Use the current thread classloader rather than Class.forName when deserializing protobuf to pojo.

Closes awslabs#186

serializer-deserializer/src/main/java/com/amazonaws/services/schemaregistry/deserializers/protobuf/ProtobufWireFormatDecoder.java

@@ -69,7 +69,7 @@ private DynamicMessage deserializeToDynamicMessage(final Descriptors.Descriptor
     private Object deserializeToPojo(final Descriptors.Descriptor descriptor, final CodedInputStream codedInputStream) {
         final String className = ProtobufClassName.from(descriptor);
         try {
-            final Class<?> classType = Class.forName(className);
+            final Class<?> classType = Thread.currentThread().getContextClassLoader().loadClass(className);
             final Method parseMethod = classType.getMethod("parseFrom", CodedInputStream.class);
             return parseMethod.invoke(classType, codedInputStream);
         } catch (Exception e) {