aspnet-traceidentifier: Support for ASP.NET (non-core) - requires IIS ETW

[snakefoot]

Attempt to resolve #328

Extracted from HttpWorkerRequest.RequestTraceIdentifier. Requires IIS ETW feature enabled: https://docs.microsoft.com/en-us/iis/configuration/system.webServer/httpTracing/ (IIS7 - Win2008)

[codecov]

Codecov Report

Merging #330 into master will decrease coverage by 2%.
The diff coverage is 0%.

@@          Coverage Diff          @@
##           master   #330   +/-   ##
=====================================
- Coverage      64%    62%   -2%     
=====================================
  Files          32     33    +1     
  Lines         450    461   +11     
  Branches       98    101    +3     
=====================================
  Hits          287    287           
- Misses        127    138   +11     
  Partials       36     36

Impacted Files	Coverage Δ
...utRenderers/AspNetTraceIdentifierLayoutRenderer.cs	0% <0%> (ø)

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[codecov]

Codecov Report

Merging #330 into master will increase coverage by <1%.
The diff coverage is 78%.

@@          Coverage Diff           @@
##           master   #330    +/-   ##
======================================
+ Coverage      64%    64%   +<1%     
======================================
  Files          32     33     +1     
  Lines         450    461    +11     
  Branches       98    101     +3     
======================================
+ Hits          287    296     +9     
  Misses        127    127            
- Partials       36     38     +2

Impacted Files	Coverage Δ
...utRenderers/AspNetTraceIdentifierLayoutRenderer.cs	82% <78%> (ø)

---

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Δ = absolute <relative> (impact), ø = not affected, ? = missing data
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[304NotModified]

Thanks! Also for the tests!