Allow external integrations to declare their own scene triggers/actions

Feature requests
,
1

External integrations should be able to declare scene triggers and actions, to extend Gladys without core updates.

2

Hi everyone!

This topic is now in development.

A PR has been opened to specify the triggers and actions of scenes declared by external integrations:

Feel free to follow the PR, test (optional, especially for small requests) and give your feedback here if needed.