[bug] [REST] Dont remove identifier root (apache#1172)

* dont remove identifier root

* remove catalog in identifier tuple

Author: kevinjqliu

pyiceberg/catalog/rest.py

@@ -575,6 +575,7 @@ def _create_table(
         fresh_partition_spec = assign_fresh_partition_spec_ids(partition_spec, iceberg_schema, fresh_schema)
         fresh_sort_order = assign_fresh_sort_order_ids(sort_order, iceberg_schema, fresh_schema)
 
+        identifier = self._identifier_to_tuple_without_catalog(identifier)
         namespace_and_table = self._split_identifier_for_path(identifier)
         if location:
             location = location.rstrip("/")
@@ -656,6 +657,7 @@ def register_table(self, identifier: Union[str, Identifier], metadata_location:
         Raises:
             TableAlreadyExistsError: If the table already exists
         """
+        identifier = self._identifier_to_tuple_without_catalog(identifier)
         namespace_and_table = self._split_identifier_for_path(identifier)
         request = RegisterTableRequest(
             name=namespace_and_table["table"],