pgsql: Add public ruleutils.c entry point to deparse a Query.

Add public ruleutils.c entry point to deparse a Query.

This has no in-core callers but will be wanted by extensions.
It's just a thin wrapper around get_query_def, so it adds little code.

Also, fix get_from_clause_item() to force insertion of an alias
for a SUBQUERY RTE item. This is irrelevant to existing uses because
RTE_SUBQUERY items made by the parser always have aliases already.
However, if one tried to use pg_get_querydef() to inspect a post-rewrite
Query, it could be an issue. In any case, get_from_clause_item already
contained logic to force alias insertion for VALUES items, so the lack
of the same for SUBQUERY is a pretty clear oversight.

In passing, replace duplicated code for selection of pretty-print
options with a common macro.

Julien Rouhaud, reviewed by Pavel Stehule, Gilles Darold, and myself

Discussion: https://postgr.es/m/20210627041138.zklczwmu3ms4ufnk@nol

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/d22646922d66012705e0e2948cfb5b4a07092a29

Modified Files
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src/backend/utils/adt/ruleutils.c | 54 ++++++++++++++++++++++++++++++---------
src/include/utils/ruleutils.h | 1 +
2 files changed, 43 insertions(+), 12 deletions(-)