Schema with Object TTL, after exported, is not importable.

[dudanogueira]

This will Fail:

from weaviate.classes.config import Configure

client.connect()
client.collections.delete("Test")

collection = client.collections.create(
    name="Test",
    object_ttl_config=Configure.ObjectTTL.delete_by_creation_time(
        time_to_live=60,
        filter_expired_objects=True
    ),
)

client.collections.delete("NewSchema")
new_schema = collection.config.get().to_dict()
new_schema["class"] = "NewTest"
client.collections.create_from_dict(new_schema)

with

UnexpectedStatusCodeError: Collection may not have been created properly.! Unexpected status code: 422, with response body: {'error': [{'message': 'ObjectTTLConfig: property "creationTime" set as "deleteOn" not found among collection properties'}]}.

This because the to_dict of the _ObjectTTLConfig is not yielding _creationTimeUnix nor _lastUpdateTimeUnix