Macro pgx::pg_module_magic

macro_rules! pg_module_magic {
    () => { ... };
}

A macro for marking a library compatible with the Postgres extension framework.

This macro was initially inspired from the pg_module macro in https://github.com/thehydroimpulse/postgres-extension.rs

Shamelessly cribbed from https://github.com/bluejekyll/pg-extend-rs