feat: add plpgsql-parse package with comment preservation for PL/pgSQL function bodies #1051

Job	Run time
parser-tests (pgsql-deparser)	2m 24s
parser-tests (plpgsql-parser)	1m 7s
parser-tests (pg-proto-parser)	1m 19s
parser-tests (plpgsql-deparser)	1m 8s
parser-tests (pgsql-parser)	1m 4s
parser-tests (@pgsql/quotes)	1m 5s
parser-tests (@pgsql/transform)	6m 26s
	14m 33s

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