Reading JSON config - Trim keys as Json allows spaces in keys

[snakefoot]

Spaces are automatically ignore in xml:

<target type="file"    fileName="hello.txt" />

But not with json:

"file" {
  "  fileName": "hello.txt"
}

See also: https://stackoverflow.com/a/61549064/193178

[codecov-io]

Codecov Report

Merging #419 into master will increase coverage by 0.06%.
The diff coverage is 94.73%.

@@            Coverage Diff             @@
##           master     #419      +/-   ##
==========================================
+ Coverage   82.29%   82.36%   +0.06%     
==========================================
  Files          14       14              
  Lines        1192     1202      +10     
  Branches      195      199       +4     
==========================================
+ Hits          981      990       +9     
  Misses        141      141              
- Partials       70       71       +1     

Impacted Files	Coverage Δ
...ensions.Logging/Config/NLogLoggingConfiguration.cs	92.34% <94.73%> (-0.12%)	⬇️

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