Made Oracle introspect boolean fields

Fixed failing test schema.tests.SchemaTests.test_add_field_temp_default_boolean
Refs #19884

django/db/backends/oracle/introspection.py

@@ -36,6 +36,8 @@ class DatabaseIntrospection(BaseDatabaseIntrospection):
         if data_type == cx_Oracle.NUMBER and description[5] == 0:
             if description[4] > 11:
                 return 'BigIntegerField'
+            elif description[4]==1:
+                return 'BooleanField'
             else:
                 return 'IntegerField'
         else: