ENH: added verbose option to data model

Very simple enhancement to allow for a silent vs. verbose option when synchronizing data models.

This is useful for integration tests.

src/caosadvancedtools/models/data_model.py

@@ -23,6 +23,11 @@
 # ** end header
 #
 from copy import deepcopy
+# TODO(fspreck) for backwards compatibility with Python < 3.9 but this is
+# actually
+# [deprecated](https://docs.python.org/3/library/typing.html#typing.List), so
+# remove this, when we drop support for old Python versions.
+from typing import List
 
 import caosdb as db
 from caosdb.apiutils import compare_entities, describe_diff