NLogLoggerProvider - Replaced dynamic assembly loading with registration methods

[snakefoot]

• Update to NLog 5.2 - https://github.com/NLog/NLog/releases/tag/v5.2.0

[codecov-commenter]

Codecov Report

Patch coverage: 88.88% and project coverage change: -0.08 ⚠️

Comparison is base (432b12f) 80.76% compared to head (7b98b88) 80.69%.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #669      +/-   ##
==========================================
- Coverage   80.76%   80.69%   -0.08%     
==========================================
  Files          19       19              
  Lines        1664     1663       -1     
  Branches      283      284       +1     
==========================================
- Hits         1344     1342       -2     
  Misses        189      189              
- Partials      131      132       +1     

Impacted Files	Coverage Δ
src/NLog.Extensions.Logging/Logging/NLogLogger.cs	82.13% <0.00%> (-0.35%)	⬇️
...g.Extensions.Logging/Logging/NLogLoggerProvider.cs	96.96% <ø> (-0.60%)	⬇️
...Logging/Config/SetupExtensionsBuilderExtensions.cs	100.00% <100.00%> (ø)
...tensions.Logging/Extensions/ConfigureExtensions.cs	71.18% <100.00%> (ø)

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