Introduced SetupExtensionLogging extension method for LogFactory.Setup

[snakefoot]

Example of how it is used:

                LogManager.Setup()
                    .SetupExtensions(s => s.AutoLoadAssemblies(false))
                    .SetupExtensionLogging(s => s.LoadNLogLoggingConfiguration(config));

[codecov-io]

Codecov Report

Merging #410 into master will increase coverage by 0.36%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #410      +/-   ##
==========================================
+ Coverage   82.08%   82.45%   +0.36%     
==========================================
  Files          12       14       +2     
  Lines        1178     1197      +19     
  Branches      194      194              
==========================================
+ Hits          967      987      +20     
  Misses        141      141              
+ Partials       70       69       -1     

Impacted Files	Coverage Δ
...xtensions.Logging/Config/SetupBuilderExtensions.cs	100.00% <100.00%> (ø)
...ing/Config/SetupLoggerProviderBuilderExtensions.cs	100.00% <100.00%> (ø)
...ensions.Logging/Config/NLogLoggingConfiguration.cs	92.45% <0.00%> (+0.47%)	⬆️

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