Convert to file-scoped namespace

[JSkimming]

No description provided.

[coveralls]

Pull Request Test Coverage Report for Build 1828123447

• 217 of 217 (100.0%) changed or added relevant lines in 5 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

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Totals
Change from base Build 1827943803:	0.0%
Covered Lines:	220
Relevant Lines:	220

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💛 - Coveralls

[codecov]

Codecov Report

Merging #145 (59835d8) into master (2f366cd) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #145   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            5         5           
  Lines          220       220           
=========================================
  Hits           220       220           

Impacted Files	Coverage Δ
....AsyncInterceptor/AsyncDeterminationInterceptor.cs	100.00% <100.00%> (ø)
...stle.Core.AsyncInterceptor/AsyncInterceptorBase.cs	100.00% <100.00%> (ø)
...le.Core.AsyncInterceptor/AsyncTimingInterceptor.cs	100.00% <100.00%> (ø)
...ore.AsyncInterceptor/ProcessingAsyncInterceptor.cs	100.00% <100.00%> (ø)
....Core.AsyncInterceptor/ProxyGeneratorExtensions.cs	100.00% <100.00%> (ø)

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