Preserve block indentation after CREATE statements

[arnodirlam]

While formatting a PL/pgSQL block, I noticed that statements after CREATE TABLE lose their enclosing indentation. This also pulls ELSE and END IF out of the block.

Before (pg_format, default options):

DO $$
BEGIN
    IF TRUE THEN
        CREATE TABLE t (
            id int
        );
ELSE
    PERFORM
        1;
END IF;
END
$$;

After:

DO $$
BEGIN
    IF TRUE THEN
        CREATE TABLE t (
            id int
        );
    ELSE
        PERFORM
            1;
    END IF;
END
$$;

The existing plancache.sql expected output had the same problem with four INSERTs after a CREATE TABLE inside a function; those now retain their enclosing indentation too.

I added a focused case covering ELSIF, ELSE, and following statements. prove -l t/ and the larger SQL corpus (perl t/regress_test.pl) pass; formatting the new case twice also gives identical output.

Thanks for maintaining pgFormatter!