BeginScope should accept any type of KeyValuePair (Swallow exceptions)

[snakefoot]

Added try-catch-logic to ensure BeginScope doesn't throw unexpectedly.

[codecov]

Codecov Report

Merging #229 into master will decrease coverage by 0.66%.
The diff coverage is 71.87%.

@@            Coverage Diff             @@
##           master     #229      +/-   ##
==========================================
- Coverage   72.05%   71.39%   -0.67%     
==========================================
  Files           6        6              
  Lines         365      374       +9     
  Branches       89       88       -1     
==========================================
+ Hits          263      267       +4     
- Misses         65       72       +7     
+ Partials       37       35       -2

Impacted Files	Coverage Δ
src/NLog.Extensions.Logging/Logging/NLogLogger.cs	72.68% <71.87%> (-1.63%)	⬇️
...g.Extensions.Logging/Logging/NLogLoggerProvider.cs	94.28% <0%> (+2.85%)	⬆️

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[304NotModified]

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