add PostgreSQL 18.4, 17.10, 16.14, 15.18, 14.23

add PostgreSQL 18.4, 17.10, 16.14, 15.18, 14.23

init

shards pg0001, pg0002

shards pg0001, pg0002

pg0002 - PUBLIC has CREATE on public schema (PG>=15)

pg0002 - PUBLIC has CREATE on public schema (PG>=15)

add LICENSE MIT

pg0001 - wrong volatility marking for json_strip_nulls and jsonb_strip_nulls