Change to file-scoped namespaces

[Shane32]

This PR contains no changes other than conversion to file-scoped namespaces, so as to reduce diff for future changes.

[Shane32]

Use 'hide whitespace' to view reduce diff in GitHub preview.

[sungam3r]

It will break all PRs. I intentionally did not change namespaces. Or do you mean that all current PRs will be rejected or solved by further changes?

[Shane32]

Well..... uhhh.... I dunno. I just am trying to help you review my PR(s).

#733 -- needs to be redone in light of serialization libraries have been moved to GraphQL.NET repo - most likely this code needs to be added to GraphQL.NET repo
#694 -- obsolete with my new subscription code
#587 -- only contains a couple lines of code that were changed
#515 -- one file is new; the other is easily merged with any changes
#279 -- obsolete with my new subscription code
#195 -- this is 3 years old now

[codecov-commenter]

Codecov Report

❌ Patch coverage is 48.62249% with 690 lines in your changes missing coverage. Please review.
✅ Project coverage is 47.93%. Comparing base (ce77ad1) to head (aab2e1b).
⚠️ Report is 190 commits behind head on develop.

Files with missing lines	Patch %	Lines
...ubscriptions.WebSockets/WebSocketReaderPipeline.cs	0.00%	84 Missing ⚠️
...rization.AspNetCore/AuthorizationValidationRule.cs	50.00%	48 Missing and 7 partials ⚠️
...NetCore/DefaultAuthorizationErrorMessageBuilder.cs	42.85%	32 Missing and 4 partials ⚠️
.../Extensions/GraphQLBuilderUserContextExtensions.cs	0.00%	33 Missing ⚠️
src/Ui.Playground/Internal/PlaygroundPageModel.cs	0.00%	33 Missing ⚠️
src/Transports.AspNetCore/GraphQLHttpMiddleware.cs	81.60%	22 Missing and 10 partials ⚠️
....Subscriptions.Abstractions/SubscriptionManager.cs	73.26%	20 Missing and 7 partials ⚠️
...criptions.WebSockets/WebSocketConnectionFactory.cs	0.00%	26 Missing ⚠️
src/Ui.Playground/PlaygroundOptions.cs	47.91%	24 Missing and 1 partial ⚠️
src/Ui.GraphiQL/Internal/GraphiQLPageModel.cs	0.00%	24 Missing ⚠️
... and 37 more

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #773   +/-   ##
========================================
  Coverage    47.93%   47.93%           
========================================
  Files           50       50           
  Lines         1552     1552           
  Branches       174      174           
========================================
  Hits           744      744           
  Misses         752      752           
  Partials        56       56           

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