imported the ast class to the main pkg

Author: MinuraPunchihewa

mindsdb_sql_parser/ast/mindsdb/__init__.py

@@ -1,4 +1,5 @@
 from .agents import CreateAgent, DropAgent, UpdateAgent
+from .alter_database import AlterDatabase
 from .create_view import CreateView
 from .create_database import CreateDatabase
 from .create_predictor import CreatePredictor, CreateAnomalyDetectionModel

mindsdb_sql_parser/parser.py

@@ -350,7 +350,7 @@ def drop_view(self, p):
        'DROP SCHEMA if_exists_or_empty identifier')
     def drop_database(self, p):
         return DropDatabase(name=p.identifier, if_exists=p.if_exists_or_empty)
-    
+
     # ALTER DATABASE
     @_('ALTER DATABASE identifier kw_parameter_list')
     def alter_database(self, p):