SET PATH does not affect events

MariaDB 12.3's new PATH variable (from MDEV-34391) seems to affect all stored objects except events. I assume this may be an accidental omission, since PATH does affect procs, funcs, views, and triggers.

That said, the documentation at https://mariadb.com/docs/server/reference/sql-statements/administrative-sql-statements/set-commands/set-path is a bit unclear about which object types are supposed to be impacted by PATH and "remembered" by the server at creation time: for example that page doesn't currently mention triggers at all, even though they are indeed affected by PATH in my testing.

Repro that shows it doesn't affect events:

CREATE DATABASE a;

USE a;

CREATE FUNCTION f() RETURNS int RETURN 42;

CREATE DATABASE b;

USE b;

SET PATH 'a';

SET GLOBAL event_scheduler=ON;

CREATE EVENT e ON SCHEDULE EVERY 5 MINUTE DO SET @bar = @bar + f();

Once the event attempts to run, server error log will show [ERROR] Event Scheduler: [root@localhost][b.e] FUNCTION b.f does not exist

Relatedly, the mysql.event table does not have a `path` column, whereas mysql.proc now has one.