Story: Add a scheduler to apply configuration at desired times or intervals

[Metal-Mighty]

Description

As a user, I would like to be able to create a scheduler integrated with the portal in order to control IoT devices at user-defined times.

Acceptance criteria

• Add a scheduling interface in the portal
• Ability to group devices in a groups hierarchy
• Support for different types of scheduled commands: command set in a device model, API query, ...
• Manage priority for schedules based on the devices' hierarchy (A schedule for a device down in the hierarchy overrides ones above it)