✨ Feat: automatically configure plugins beforehand and provide them a settings object

[Millefeuille42]

Feature description

Currently, plugins have access to the configurator, and thus the CFG object.
While this permits proper -- per tracim's standards -- configuration, this is not enforced.

We should provide a mechanism that will automatically acquire settings of the plugins through the CFG object and provide them a settings object.

How it works

We could acquire specific attributes in the plugin's class instance
like __name__, config_map or such fields to automatically define it's configuration namespace

We also could enforce that plugins inherits a class that enforces specific attributes and methods that we will use for each loaded plugin.

Related PR

No response