Sqlgpt-parser

* add visit_time_interval
python
def visit_time_interval(self, node, context):
return f"INTERVAL {self.process(node.value, context)} {node.unit.upper()}"

* change function_call from args to arguments

* rename sql_parser to parser

* rename src to sqlgpt_parser

Move format code from https://github.com/oceanbase/sql-lifecycle-management
Fix some bugs in the parser
Add cast, convert,group_concat etc format code

Publish the first version