Add support for Postgres v13.
These are the broad changes in v13, most base SQLs are not yet supported so NA for this task.

1. ALTER NO DEPENDS ON - not yet supported
2. ALTER STATISTICS SET STATISTICS - not yet supported
3. ALTER TABLE ALTER COLUMN DROP EXPRESSION - generated identity not yet supported
4. ALTER TABLE SET STORAGE - no change required
5. ALTER TYPE - not yet supported
6. ALTER VIEW RENAME COLUMN - not supported
7. CREATE DATABASE WITH LOCALE - not supported
8. CREATE INDEX - deduplication - no change required
9. CREATE TABLE / ALTER TABLE - new attributes - PENDING
10. CREATE TABLESPACE - not yet supported
11. DROP DATABASE FORCE - not yet supported
12. EXPLAIN ANALYSE - not yet supported
13. INSERT - Remove "Cannot insert intocolumn"?? PENDING
14. ROW - not yet supported
15. SELECT WITH TIES - not yet supported
16. VACUUM PARALLEL - PENDING