Introduce bultin device models (with builtin commands)

[kbeaugrand]

Description

see: #217

What's new?

Add the possibility (by API) to create builtin device models (and commands). These device models are not modifiable via the UI (but still with APIs).
This provide a way to automatically deploy the solution wit builtin features that are extensible.

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 #259 (0891936) into main (21187b1) will increase coverage by 6.86%.
The diff coverage is 81.04%.

@@            Coverage Diff             @@
##             main     #259      +/-   ##
==========================================
+ Coverage   19.89%   26.76%   +6.86%     
==========================================
  Files          77       77              
  Lines        2332     2425      +93     
==========================================
+ Hits          464      649     +185     
+ Misses       1868     1776      -92     

Impacted Files	Coverage Δ
...ent/Pages/DeviceModels/DeviceModelDetailPage.razor	0.00% <0.00%> (ø)
...lient/Pages/DeviceModels/DeviceModelListPage.razor	0.00% <0.00%> (ø)
.../Server/Controllers/v1.0/DeviceModelsController.cs	78.88% <78.09%> (+78.88%)	⬆️
.../Controllers/v1.0/DeviceModelCommandsController.cs	91.66% <88.88%> (+91.66%)	⬆️
...rtal/Server/Managers/DeviceModelCommandsManager.cs	88.57% <100.00%> (-1.91%)	⬇️
....Portal/Server/Mappers/DeviceModelCommandMapper.cs	100.00% <100.00%> (ø)
...eIoTHub.Portal/Server/Mappers/DeviceModelMapper.cs	100.00% <100.00%> (ø)
...ureIoTHub.Portal/Shared/Models/v1.0/DeviceModel.cs	100.00% <100.00%> (ø)
...ub.Portal/Shared/Models/v1.0/DeviceModelCommand.cs	100.00% <100.00%> (ø)
... and 1 more

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