support postgresql 14

[Leo-XM-Zeng]

Postgres 14

make check

[Leo-XM-Zeng]

Hello, I can try to support postgresql 15 if needed

[JelteF]

Thanks a lot for your effort here. A few things before I think this can be merged:

1. I think merging this, requires adding PG15 support as well. Leaving a gap of the versions we support between PG14 and PG16 seems too confusing.
2. PG14 (and PG15) should be added to Github Actions testing
3. The original PG ruleutils should be added in a separate commit from the rest of the changes, just like I did in Vendor in Postgres ruleutils and handle public.read_csv #140. That will make it easy to track where certain lines of code come from using git blame.

[Leo-XM-Zeng]

Thanks a lot for your effort here. A few things before I think this can be merged:

1. I think merging this, requires adding PG15 support as well. Leaving a gap of the versions we support between PG14 and PG16 seems too confusing.
2. PG14 (and PG15) should be added to Github Actions testing
3. The original PG ruleutils should be added in a separate commit from the rest of the changes, just like I did in Vendor in Postgres ruleutils and handle public.read_csv #140. That will make it easy to track where certain lines of code come from using git blame.

Ok, thank you for your guidance. Then I will finish PG15 first as required