Use file-scoped namespaces with imports outside

[atifaziz]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 97.48996% with 25 lines in your changes missing coverage. Please review.
✅ Project coverage is 97.53%. Comparing base (883d615) to head (5406da1).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/CSharpMinifier/CSharpString.cs	95.54%	6 Missing and 1 partial ⚠️
src/CSharpMinifier/Minifier.cs	96.26%	2 Missing and 2 partials ⚠️
src/CSharpMinifier/Region.cs	63.63%	3 Missing and 1 partial ⚠️
src/CSharpMinifier/Scanner.cs	99.23%	2 Missing and 1 partial ⚠️
src/CSharpMinifier/UnreachableException.cs	0.00%	3 Missing ⚠️
src/CSharpMinifier/JsonString.cs	96.15%	2 Missing ⚠️
src/CSharpMinifier/SyntaxErrorException.cs	33.33%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #44   +/-   ##
=======================================
  Coverage   97.53%   97.53%           
=======================================
  Files          12       12           
  Lines        1095     1095           
  Branches      314      314           
=======================================
  Hits         1068     1068           
  Misses         20       20           
  Partials        7        7           

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