Add support for asynchronous notifications

If a notification handler is set using

  db:set_notifier(cb)

then the event loop will be kept alive until
db:close() is called or the event loop.

Prior to this a database connection would
never keep the event loop running.

https://www.postgresql.org/docs/current/libpq-notify.html

Signed-off-by: Asbjørn Sloth Tønnesen <ast@2e8.dk>

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