support for mssql `json_object` syntax

[lovasoa]

SQL server has a json_object function with a special syntax that uses colons instead of commas between json keys and values.

SELECT JSON_OBJECT('name':'value', 'type':1)

This is not yet supported in sqlparser. This would be useful in SQLPage where we use json for advanced features.

Reference: https://learn.microsoft.com/en-us/sql/t-sql/functions/json-object-transact-sql?view=sql-server-ver16

@gaoqiangz this may be of interest to you :)

[gaoqiangz]

👌