pg_stat_statements: Add tests for SQL/JSON query patterns

A new test file is added to track how the various SQL/JSON query
patterns fare in PGSS, as allowed by the parser:
- Query functions
- JSON_TABLE
- Constructors and predicates.
- etc.

This will be handy for the evaluation of some follow-up patches that aim
to tweak the query jumbling for a portion of some of these SQL/JSON
queries.  Some of them are currently slightly broken, tracking as
parameters what should be a keyword, and we never knew about them.
Until now.

The author has written most of the patch.  I have noticed a couple of
gaps and some inconsistencies upon further review, leading to a result
more consistent with the usual approach used by the PGSS tests.

Author: Ilya Staroverov <[email protected]>
Reviewed-by: Michael Paquier <[email protected]>
Discussion: 
https://postgr.es/m/[email protected]

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/ae75d12b500f01eb3ce9a46418beb2e9301e3e0b

Modified Files
--------------
contrib/pg_stat_statements/Makefile             |    1 +
contrib/pg_stat_statements/expected/sqljson.out | 1369 +++++++++++++++++++++++
contrib/pg_stat_statements/meson.build          |    1 +
contrib/pg_stat_statements/sql/sqljson.sql      |  391 +++++++
4 files changed, 1762 insertions(+)

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