New rule: require schema

[hfhchan-plb]

Require all (non-temp) table names to have a schema (e.g. public).

This makes scripts portable even when the search_path changes.

[sbdchd]

wonder if this rule would also include schema on function definitions:

https://www.instantdb.com/essays/pg_upgrade#marked-fn-8

[Flaiers]

@sbdchd Hello, voting for this feature. Are there any restrictions on doing this?

Why not start with a rule for DDL on tables?

[Flaiers]

#1046