Follow-up to #3847.
Adds support for subqueries in all other positions of a SELECT (the
result list, GROUP BY, ORDER BY, HAVING, LIMIT, OFFSET).
Turns out I am a sql noob and didn't realize that correlated subqueries
are supported in basically all positions except LIMIT/OFFSET, so added
support for those too + accompanying TCL tests.
Thankfully the abstractions introduced in #3847 carry over to this very
well so the code change is relatively small (over half of the diff is
tests and a lot of the remaining diff is just moving logic around).
Reviewed-by: Preston Thorpe <preston@turso.tech>
Closes#3852
4bf8ad8cfd