This patch provides the possibility to implement a custom security layer on top
of Odoo's bus notification system which uses postgresql's NOTIFY command.

The key addition is the `ODOO_NOTIFY_FUNCTION` environment variable (opt-in),
which can now define a postgresql function to be called instead of the NOTIFY
command. This allows for greater flexibility and control over the notification
and triggering mechanisms within Odoo.

closes odoo/odoo#130368

Signed-off-by: Fabien Meghazi (fme) <fme@odoo.com>

Starting the Odoo server with more than one worker results in repeated
"Bus unavailable" exceptions in the server log.

This seems related to the change made at
https://github.com/odoo/odoo/commit/a2ed3d3d5bdb6025a1ba14ad557a115a86413e65



 Investigation shows the the bus model file is loaded before gevented
 mode is started, and thus the wroker won't have the ImDispach
 available.

closes odoo/odoo#111352

Signed-off-by: Stockbauer Matthieu (tsm) <tsm@odoo.com>

Also, define `Event` attribute in `__init__` where it belongs.

Part-of: odoo/odoo#98081

The license is missing in most enterprise manifest so
the decision was taken to make it explicit in all cases.
When not defined, a warning will be triggered starting from
14.0 when falling back on the default LGPL-3.

closes odoo/odoo#74231

Related: odoo/enterprise#19850
Related: odoo/design-themes#43
Signed-off-by: Xavier Dollé (xdo) <xdo@odoo.com>