Implement IoT Hub Station twin

[kbeaugrand]

PR for implementing Station twin in IoT Hub implementation

What is being addressed

Implementing the station twin, helps me to decouple LoRa management facade from the IoT Hub device twin.

How is this addressed

• Create the IStationTwin interface
• Implement new method in Registry manager to retrieve station by its StationEui
• Adapt unit test

[codecov-commenter]

Codecov Report

Merging #1822 (8850e5e) into dev (077f7fb) will decrease coverage by 0.00%. The diff coverage is 90.90%.

@@            Coverage Diff             @@
##              dev    #1822      +/-   ##
==========================================
- Coverage   87.41%   87.40%   -0.01%     
==========================================
  Files         251      252       +1     
  Lines        9573     9575       +2     
==========================================
+ Hits         8368     8369       +1     
- Misses       1205     1206       +1     

Impacted Files	Coverage Δ
...RaEngine/LoraKeysManagerFacade/EdgeDeviceGetter.cs	96.42% <ø> (ø)
...dule/LoraTools/IoTHubImpl/IoTHubRegistryManager.cs	96.77% <0.00%> (-0.79%)	:arrow_down:
...Wan.NetworkServerDiscovery/TagBasedLnsDiscovery.cs	86.04% <100.00%> (-0.32%)	:arrow_down:
...SrvModule/LoraTools/IoTHubImpl/IoTHubDeviceTwin.cs	92.30% <100.00%> (ø)
...rvModule/LoraTools/IoTHubImpl/IoTHubStationTwin.cs	100.00% <100.00%> (ø)

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[kbeaugrand]

@Mandur, @danigian can we merge it ?

[Mandur]

Tests are ok (still flakiness in multiconcentrators, CUPS and discovery that need to be investigated)