NLogProviderOptions - Added LoggingConfigurationSectionName

[snakefoot]

Enables automatic loading of NLog-LoggingConfiguration from appsettings.json when the following conditions are true:

• No configuration has been loaded already
• NLogProviderOptions.LoggingConfigurationSectionName has been assigned. Ex. to "NLog"
• The available host-configuration has the specified section, and it contains config-items.

With NLog 5.0 then the default-value can be changed to "NLog" so it will always automatically load NLog LoggingConfiguration from appsettings.json (if no other configuration has been loaded already)

[304NotModified]

Looks good! Important is the naming, other comment is minor

[codecov-commenter]

Codecov Report

Merging #501 (167b5e2) into master (084cd50) will increase coverage by 0.17%.
The diff coverage is 78.57%.

@@            Coverage Diff             @@
##           master     #501      +/-   ##
==========================================
+ Coverage   80.96%   81.14%   +0.17%     
==========================================
  Files          16       16              
  Lines        1345     1379      +34     
  Branches      234      235       +1     
==========================================
+ Hits         1089     1119      +30     
+ Misses        172      171       -1     
- Partials       84       89       +5     

Impacted Files	Coverage Δ
...tensions.Logging/Extensions/ConfigureExtensions.cs	55.08% <33.33%> (+1.57%)	⬆️
...tensions.Hosting/Extensions/ConfigureExtensions.cs	85.29% <83.33%> (+1.96%)	⬆️
...ns.Logging/Internal/RegisterNLogLoggingProvider.cs	96.66% <93.33%> (-3.34%)	⬇️
....Extensions.Logging/Logging/NLogProviderOptions.cs	100.00% <100.00%> (ø)
...ensions.Logging/Config/NLogLoggingConfiguration.cs	90.94% <0.00%> (-1.40%)	⬇️
...ing/LayoutRenderers/ConfigSettingLayoutRenderer.cs	82.60% <0.00%> (+4.34%)	⬆️

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[304NotModified]

LGTM thanks!

[snakefoot]

Thank you for the review.