NLogProviderOptions with support for CaptureEventId.EventId + EventName

[snakefoot]

Now captures EventId (integer) + EventName (string). Replacing EventId_Id and EventId_name. Resolves #553

Introduced option CaptureEventId and when assigned to Legacy then it will use old style.

Follow up to #319 and #538

[codecov-commenter]

Codecov Report

Merging #554 (7f1ad19) into master (5b14701) will decrease coverage by 0.00%.
The diff coverage is 62.06%.

@@            Coverage Diff             @@
##           master     #554      +/-   ##
==========================================
- Coverage   79.41%   79.40%   -0.01%     
==========================================
  Files          18       18              
  Lines        1516     1525       +9     
  Branches      254      257       +3     
==========================================
+ Hits         1204     1211       +7     
- Misses        187      188       +1     
- Partials      125      126       +1     

Impacted Files	Coverage Δ
src/NLog.Extensions.Logging/Logging/NLogLogger.cs	82.13% <54.54%> (-0.14%)	⬇️
...ions.Logging/Layouts/MicrosoftConsoleJsonLayout.cs	61.95% <75.00%> (ø)
.../LayoutRenderers/MicrosoftConsoleLayoutRenderer.cs	73.01% <100.00%> (ø)
....Extensions.Logging/Logging/NLogProviderOptions.cs	94.44% <100.00%> (ø)

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