fix: export new model for create_empty_table (#212)

This PR exports the new model classes `CreateEmptyTableRequest` and
`CreateEmptyTableResponse`.

Co-authored-by: Bryan Keller <bkeller@netflix.com>

Author: bryanck

python/lance_namespace/src/lance_namespace/__init__.py

@@ -30,6 +30,8 @@
     DeregisterTableRequest,
     DeregisterTableResponse,
     CountTableRowsRequest,
+    CreateEmptyTableRequest,
+    CreateEmptyTableResponse,
     CreateTableRequest,
     CreateTableResponse,
     InsertIntoTableRequest,
@@ -80,6 +82,8 @@
     "DeregisterTableRequest",
     "DeregisterTableResponse",
     "CountTableRowsRequest",
+    "CreateEmptyTableRequest",
+    "CreateEmptyTableResponse",
     "CreateTableRequest",
     "CreateTableResponse",
     "InsertIntoTableRequest",