Handle DT State Publishing Instead of single properties

[piconem]

Currently, each variation of a property triggers a new event publishing.
From a "formal" point of view it will be better to publish a new DTState associated with a timestamp that will be received by Digital Adapters.

An interesting point can be to allow to "label" the field that changes with respect to the previous version allowing for example
Digital Adapter to handle only the variation without manually checking the differences.

Evaluate Json Patch to handle single variation on the Digital Twin State when a notification will be sent to a Digital Adapter: https://jsonpatch.com/

[samubura]

Partially addressed in #16
Consider closing and reopening with a more fine-grained issue on the missing parts.