Use Azure App Insights for telemetry

[christianhelle]

This pull request adds telemetry logging to both Exceptionless and App Insights.

It includes a new package reference to Microsoft.ApplicationInsights.WindowsServer and modifies the Analytics class to configure and log telemetry using the TelemetryClient. The LogFeatureUsage method has been updated to log feature usage to both Exceptionless and App Insights.

Additionally, a new SupportKeyInitializer class has been added to initialize the support key property in telemetry.

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.71%. Comparing base (3ca1a28) to head (e55c87c).
Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #490      +/-   ##
==========================================
- Coverage   94.58%   91.71%   -2.88%     
==========================================
  Files          51       51              
  Lines        2493     2607     +114     
==========================================
+ Hits         2358     2391      +33     
- Misses        108      189      +81     
  Partials       27       27              

Flag	Coverage Δ
unittests	91.71% <ø> (-2.88%)	⬇️

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