Add dashboard with metrics add main page

[hocinehacherouf]

Description

What's new?

• Implement Story: As a user I want to have a dashboard of my platform instance #781

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 #856 (4d11305) into main (affd724) will increase coverage by 0.25%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #856      +/-   ##
==========================================
+ Coverage   82.93%   83.19%   +0.25%     
==========================================
  Files         149      153       +4     
  Lines        5234     5277      +43     
==========================================
+ Hits         4341     4390      +49     
+ Misses        893      887       -6     

Impacted Files	Coverage Δ
...lient/Pages/Dashboard/DashboardMetricCounter.razor	100.00% <100.00%> (ø)
...rtal/Client/Pages/Dashboard/DashboardMetrics.razor	100.00% <100.00%> (ø)
...b.Portal/Client/Services/DashboardLayoutService.cs	100.00% <100.00%> (ø)
...l/Client/Services/DashboardMetricsClientService.cs	100.00% <100.00%> (ø)
src/AzureIoTHub.Portal/Client/Shared/NavMenu.razor	94.44% <100.00%> (+16.66%)	⬆️
...tal/Server/Controllers/v1.0/DashboardController.cs	100.00% <100.00%> (ø)

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