Add Application Insights telemetry

[kbeaugrand]

Description

What's new?

• Add application insights nuget package

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-commenter]

Codecov Report

Merging #212 (efd70c1) into main (86ef1c0) will decrease coverage by 0.00%.
The diff coverage is 0.00%.

@@           Coverage Diff            @@
##            main    #212      +/-   ##
========================================
- Coverage   5.92%   5.92%   -0.01%     
========================================
  Files         71      71              
  Lines       2362    2363       +1     
========================================
  Hits         140     140              
- Misses      2222    2223       +1     

Impacted Files	Coverage Δ
src/AzureIoTHub.Portal/Server/Startup.cs	0.00% <0.00%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 86ef1c0...efd70c1. Read the comment docs.