feat: add plpgsql-parse package with comment preservation for PL/pgSQL function bodies #1052

Job	Run time
parser-tests (plpgsql-deparser)	1m 16s
parser-tests (pgsql-deparser)	2m 25s
parser-tests (pgsql-parser)	1m 10s
parser-tests (plpgsql-parser)	1m 6s
parser-tests (@pgsql/transform)	6m 1s
parser-tests (@pgsql/quotes)	1m 6s
parser-tests (pg-proto-parser)	1m 14s
	14m 18s

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