IJsonApiEndpointFilter: remove controller action methods at runtime

[bkoelman]

This PR adds IJsonApiEndpointFilter, which enables to remove controller action methods at runtime. This comes in handy in tests, where variation is needed without relying on declarative GenerateControllerEndpoints usage.

QUALITY CHECKLIST

• Changes implemented in code
• Complies with our contributing guidelines
• Adapted tests
• N/A: Documentation updated

[codecov]

Codecov Report

Attention: Patch coverage is 85.48387% with 9 lines in your changes missing coverage. Please review.

Project coverage is 90.66%. Comparing base (980a67d) to head (5dd48c4).
Report is 4 commits behind head on master.

Files with missing lines	Patch %	Lines
...etCore/Middleware/HttpMethodAttributeExtensions.cs	81.81%	3 Missing and 3 partials ⚠️
...ore/Controllers/BaseJsonApiOperationsController.cs	71.42%	1 Missing and 1 partial ⚠️
...iDotNetCore/Middleware/JsonApiRoutingConvention.cs	95.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1646      +/-   ##
==========================================
- Coverage   90.68%   90.66%   -0.02%     
==========================================
  Files         353      355       +2     
  Lines       11515    11559      +44     
  Branches     1898     1905       +7     
==========================================
+ Hits        10442    10480      +38     
- Misses        702      705       +3     
- Partials      371      374       +3     

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