157 use filescoped namespaces

[Sevitas]

Motivation

Which issue does this fix? Fixes #157

Checklist

• [x] Code follows coding conventions held in this repo
• [x] Tests are passing
• [x] Temporary settings (e.g. variables used during development and testing) have been reverted to defaults

How to test

Everything works as expected

[codecov[bot]]

Codecov Report

Merging #159 (de3243e) into master (79c4949) will not change coverage. The diff coverage is 85.85%.

@@           Coverage Diff           @@
##           master     #159   +/-   ##
=======================================
  Coverage   87.62%   87.62%           
=======================================
  Files          26       26           
  Lines         824      824           
  Branches       72       72           
=======================================
  Hits          722      722           
  Misses         86       86           
  Partials       16       16           

Impacted Files	Coverage Δ
...ontent.Ai.ModelGenerator.Core/CodeGeneratorBase.cs	48.10% <50.00%> (ø)
src/Kontent.Ai.ModelGenerator/Program.cs	55.81% <54.05%> (ø)
...nt.Ai.ModelGenerator.Core/DeliveryCodeGenerator.cs	74.68% <75.00%> (ø)
...rator.Core/Generators/TypeProviderCodeGenerator.cs	84.12% <79.41%> (ø)
....Ai.ModelGenerator.Core/ManagementCodeGenerator.cs	87.27% <84.09%> (ø)
...or.Core/Generators/Class/BaseClassCodeGenerator.cs	94.23% <93.93%> (ø)
.../Kontent.Ai.ModelGenerator.Core/Common/Property.cs	96.61% <96.29%> (ø)
...Generator.Core/Common/ClassCodeGeneratorFactory.cs	100.00% <100.00%> (ø)
...t.Ai.ModelGenerator.Core/Common/ClassDefinition.cs	100.00% <100.00%> (ø)
...enerator.Core/Common/InvalidIdentifierException.cs	100.00% <100.00%> (ø)
... and 36 more

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