Fix missing FORMAT when deparsing JSON_ARRAY(query)

Hi,

While testing "[8d829f5a0] Fix JSON_ARRAY(query) empty set handling and view deparsing”, I found that the departing may omit the FORMAT JSON clause.

Here is a simple repro:
```
evantest=# create view v as
evantest-# select json_array(select '{"a": 1}'::text format json) as j;
CREATE VIEW
evantest=# select * from v;
j
------------
[{"a": 1}]
(1 row)

evantest=# select pg_get_viewdef('v'::regclass, true);
pg_get_viewdef
---------------------------------------------------------------------------
SELECT JSON_ARRAY( SELECT '{"a": 1}'::text AS text RETURNING json) AS j;
(1 row)

evantest=# select pg_get_viewdef('v'::regclass, false);
pg_get_viewdef
---------------------------------------------------------------------------
SELECT JSON_ARRAY( SELECT '{"a": 1}'::text AS text RETURNING json) AS j;
(1 row)

evantest=# SELECT JSON_ARRAY( SELECT '{"a": 1}'::text AS text RETURNING json) AS j;
j
----------------
["{\"a\": 1}"]
(1 row)
```

As shown above, I defined the view with FORMAT JSON, but the deparsed SQL has lost that clause. Running the deparsed SELECT produces a different result from selecting from the view because FORMAT JSON is missing.

Currently, JsonConstructorExpr does not store the JsonFormat information. To fix this problem, we need to add a JsonFormat field to JsonConstructorExpr. Please see the attached patch for details.

With the fix:
```
evantest=# select pg_get_viewdef('v'::regclass, true);
pg_get_viewdef
---------------------------------------------------------------------------------------
SELECT JSON_ARRAY( SELECT '{"a": 1}'::text AS text FORMAT JSON RETURNING json) AS j;
(1 row)

evantest=# SELECT JSON_ARRAY( SELECT '{"a": 1}'::text AS text FORMAT JSON RETURNING json) AS j;
j
------------
[{"a": 1}]
(1 row)
```

Best regards,
--
Chao Li (Evan)
HighGo Software Co., Ltd.
https://www.highgo.com/