NLogLoggerFactory - ReOptimize concurrency for CreateLogger

[RockNHawk]

ReOptimize concurrency for CreateLogger. Followup to #692

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All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 81.75%. Comparing base (71af10a) to head (845ba8c).

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #769 +/- ## ========================================== - Coverage 81.76% 81.75% -0.02% ========================================== Files 19 19 Lines 1810 1803 -7 Branches 321 320 -1 ========================================== - Hits 1480 1474 -6 Misses 188 188 + Partials 142 141 -1 ```

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[snakefoot]

Thank you for your contribution, but I prefer to stay aligned with the official LoggerFactory from DotNet-runtime:

https://github.com/dotnet/runtime/blob/main/src/libraries/Microsoft.Extensions.Logging/src/LoggerFactory.cs

See also: https://devblogs.microsoft.com/dotnet/performance-improvements-in-net-8/#logging

Or do you experience performance issue on docker-images with restricted number of cpu-cores?

[RockNHawk]

Thank you for your contribution, but I prefer to stay aligned with the official LoggerFactory from DotNet-runtime:感谢您的贡献，但我更愿意与 DotNet-runtime 的官方 LoggerFactory 保持一致：

https://github.com/dotnet/runtime/blob/main/src/libraries/Microsoft.Extensions.Logging/src/LoggerFactory.cs

See also: https://devblogs.microsoft.com/dotnet/performance-improvements-in-net-8/#logging另请参阅：https://devblogs.microsoft.com/dotnet/performance-improvements-in-net-8/#logging

Or are you experience performance issue on docker-images with restricted number of cpu-cores?或者您是否在 cpu 内核数量受限的 docker-images 上遇到性能问题？

Okay, maybe I need a performance test to compare which is faster, ConcurrentDictionary also uses lock within TryAdd, but it's a fine-grained one.