Disconnect was sent to all CellularContext classes even it concerned
one specific context. Some disconnect events are still sent to all
context classes. These event are coming from network and ment for all
context classes or event did not specify cid.
This was left accidentally after refactoring.
It wasn't giving correct states after refactoring.
CellularContext::get_connection_status should be used instead.
-added an API for checking network eps ciot optimization support
-renamed the API for getting the UE parameters
-the API for setting the UE parameters includes now a callback, which
will be called once network support for eps ciot optimization is known