Add support for new syntax in JSON_OBJECT and JSON_ARRAY

[zijchen]

Docs:

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

JSON_OBJECT has new key value pair syntax like this: <json_key_value> ::= json_key_name : value_expression

Both functions also have a new clause <json_null_clause> that can be either NULL ON NULL or ABSENT ON NULL