Filter devices at iot hub level

[kbeaugrand]

Description

#243

What's new?

• Internal changes to query devices nd filter it at the IoT Hub query
• Add new unit tests to cover the IoT Hub Registry manager wrapper

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Documentation content changes
• Tests
• Other

[codecov]

Codecov Report

Merging #270 (73edbb9) into main (9e060d6) will increase coverage by 1.95%.
The diff coverage is 69.23%.

@@            Coverage Diff             @@
##             main     #270      +/-   ##
==========================================
+ Coverage   26.76%   28.71%   +1.95%     
==========================================
  Files          77       77              
  Lines        2425     2417       -8     
==========================================
+ Hits          649      694      +45     
+ Misses       1776     1723      -53     

Impacted Files	Coverage Δ
...zureIoTHub.Portal/Server/Services/DeviceService.cs	86.15% <55.55%> (+86.15%)	⬆️
...ortal/Server/Controllers/v1.0/DevicesController.cs	66.25% <100.00%> (-2.36%)	⬇️
...Controllers/v1.0/LoRaWANConcentratorsController.cs	73.33% <100.00%> (-2.06%)	⬇️

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