Update middleware with options and new design

[Shane32]

TODO

• Read up on BatchedRequestsExecuteInParallel in some batching docs/specs
• Implement BatchedRequestsConcurrencyLimit as a new feature in a separate PR or here.
• Take a look at options regarding GraphQLRequestExecutionResult

[Shane32]

If we merge #773 then it will reduce the diff here in this PR. Most changed files in this PR have file-scoped namespaces.

[Shane32]

@sungam3r This PR is a copy of my implementation with almost no changes. I have commented out the code that is needed to support websockets once we merge the updated websocket support. Until then it will still use the old websocket middleware.

If we want to make changes here, we should make them in a separate PR. For instance, if we want to reintroduce the CancellationToken virtual member (which is fine; it will not significantly change the code), let's make a separate PR to do so. I want to keep track of the diff between this and GraphQL.AspNetCore3.

[Shane32]

The few changes to tests involve mutation requests against a GET endpoint, and error message results.

[sungam3r]

Need to update branch? Will nothing bad happen?

[sungam3r]

@Shane32 Check description of https://github.com/graphql-dotnet/server/milestone/7

[sungam3r]

I do not promise that I can review tomorrow. I had a challenge at work so most likely on the weekend.

[codecov-commenter]

Codecov Report

Merging #774 (b4c6501) into develop (6bba2cb) will decrease coverage by 0.22%.
The diff coverage is 56.90%.

@@             Coverage Diff             @@
##           develop     #774      +/-   ##
===========================================
- Coverage    47.80%   47.58%   -0.23%     
===========================================
  Files           50       59       +9     
  Lines         1548     1715     +167     
  Branches       174      204      +30     
===========================================
+ Hits           740      816      +76     
- Misses         752      822      +70     
- Partials        56       77      +21     

Impacted Files	Coverage Δ
.../Transports.AspNetCore/Errors/AccessDeniedError.cs	0.00% <0.00%> (ø)
...NetCore/Errors/BatchedRequestsNotSupportedError.cs	0.00% <0.00%> (ø)
...re/Errors/WebSocketSubProtocolNotSupportedError.cs	0.00% <0.00%> (ø)
.../Extensions/GraphQLBuilderUserContextExtensions.cs	0.00% <0.00%> (ø)
...sions/GraphQLHttpEndpointRouteBuilderExtensions.cs	0.00% <0.00%> (ø)
src/Transports.AspNetCore/UserContextBuilder.cs	0.00% <0.00%> (ø)
src/Transports.AspNetCore/AuthorizationHelper.cs	11.42% <11.42%> (ø)
...ensions/GraphQLHttpApplicationBuilderExtensions.cs	31.25% <25.00%> (-10.42%)	⬇️
...rc/Transports.AspNetCore/HttpPostValidationRule.cs	42.85% <42.85%> (ø)
...ports.AspNetCore/Errors/InvalidContentTypeError.cs	50.00% <50.00%> (ø)
... and 11 more

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[sungam3r]

Finished! I resolved all conversation except one with subscriptions/websockets explanations as a reminder for me to read later.