python: datamodel module moved out of manager module

python/knot_resolver_manager/__init__.py

python/knot_resolver_manager/client/__init__.py

python/knot_resolver_manager/client/command.py

python/knot_resolver_manager/client/commands/cache.py

python/knot_resolver_manager/client/commands/convert.py

python/knot_resolver_manager/client/commands/schema.py

python/knot_resolver_manager/client/commands/validate.py

python/knot_resolver_manager/controller/__init__.py

python/knot_resolver_manager/controller/interface.py

.../knot_resolver_manager/controller/supervisord/__init__.py

...ot_resolver_manager/controller/supervisord/config_file.py

python/knot_resolver_manager/datamodel/__init__.py

python/knot_resolver_manager/datamodel/cache_schema.py

python/knot_resolver_manager/datamodel/config_schema.py

python/knot_resolver_manager/datamodel/design-notes.yml

python/knot_resolver_manager/datamodel/dns64_schema.py

python/knot_resolver_manager/datamodel/dnssec_schema.py

python/knot_resolver_manager/datamodel/forward_schema.py

python/knot_resolver_manager/datamodel/globals.py

python/knot_resolver_manager/datamodel/local_data_schema.py