Support HIVE VIEW with LATERAL VIEW json_tuple without AS

[findepi]

Follow up to #7242

Add support for "Unalias case" described here #7242 (comment)

Unalias case

SELECT * FROM t AS t LATERAL VIEW json_tuple(jsonstr, "name", "surname", "user_id") x;

+----------------------------------------------------+----------+-----------+-------+
|                     t.jsonstr                      |   x.c0   |   x.c1    | x.c2  |
+----------------------------------------------------+----------+-----------+-------+
| {"user_id": 1000, "name": "Mateusz", "surname": "Gajewski"} | Mateusz  | Gajewski  | 1000  |
+----------------------------------------------------+----------+-----------+-------+

This introduces a relation x with fields c0, c1 and c2.
As with any relation, the fields can be accssed using qualified or unqualified
names:

SELECT c0, x.c1 FROM t AS t LATERAL VIEW json_tuple(jsonstr, "name", "surname", "user_id") x;

+----------+-----------+
|    c0    |   x.c1    |
+----------+-----------+
| Mateusz  | Gajewski  |
+----------+-----------+

The unaliased case is easy to support -- we know number of columns statically,
so we can enumerate c0, c1, ... and fold that into the aliased case below.