Separate the property and the events of the resources

[joshuachp]

We should make the following changes to the current interfaces:

• The property should reflect the state of the resource as seen by the Edgehog Device Runtime (e.g. Start command)
• We should add a data stream interface to send the events to Edgehgo Manager (e.g. Container stopped)

This is to make it clearer the current state of the device to the cloud and separate the events system to the main container service on the device.