Adding missing postgres headers to bindings

[Termina1]

I'm trying to write FDW using pgx. I found out that:

pg_foreign_server.h
pg_foreign_table.h

are not included in the bindings generation. Is it possible to add them, so I could use constants defined there.

[Termina1]

Also include/executor/tuptable.h

[eeeebbbbrrrr]

Thanks. I’ll take a look at this next week. If you want to save some time feel free to edit pgx’ include/*.h files and put up a PR.

[Termina1]

Ok, I'm planning to make a PR with few patches for better support of FDW. I'll include those changes in the PR.