Begin giant move terms function with test of named parameters

As we move this function in from custom code.

migration_helpers.module

@@ -34,6 +34,33 @@ function migration_helpers_entity_query(
 
 }
 
+/**
+ * Move (and optionally filter/transform) terms between term reference fields.
+ */
+function migration_helpers_move_terms(
+  $source_vocabulary,
+  $destination_vocabulary,
+  $source_field,
+  $destination_field,
+  $source_bundle,
+  $destination_bundle = NULL,
+  $source_entity_type = 'node',
+  $destination_entity_type = 'node',
+  $mapping = [],
+) {
+  // Destination bundle is also required but we default to making it
+  // the same as the source bundle.
+  $destination_bundle ??= $source_bundle;
+    print("
+    $source_entity_type,
+    $source_bundle,
+    $source_field,
+    $destination_entity_type,
+    $destination_bundle,
+    $destination_field,
+    $source_vocabulary,
+    $destination_vocabulary");
+}
 
 // The below almost serve more as examples that can be followed