Add MapSwaggerUI and MapReDoc to support endpoint routing

[Strepto]

Pull Request

The issue or feature being addressed

Fixes #1726

Details on the issue fix or feature implementation

I tried following the API and making the change as small as possible. The biggest benefit of this change is to allow login protection of the Swagger endpoint via

app.MapSwaggerUI().RequireAuthorization();

Which allows us to secure the openapi spec and the swagger UI 👍

Remarks

I did not test if this works in other dotnet versions. I assume the CI tests will be able to check this for me.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.05%. Comparing base (b03fdec) to head (3912023).
⚠️ Report is 44 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3822      +/-   ##
==========================================
+ Coverage   94.93%   95.05%   +0.12%     
==========================================
  Files         111      111              
  Lines        3886     3944      +58     
  Branches      784      795      +11     
==========================================
+ Hits         3689     3749      +60     
+ Misses        197      195       -2     

Flag	Coverage Δ
Linux	95.05% <100.00%> (+0.12%)	⬆️
Windows	95.05% <100.00%> (+0.12%)	⬆️
macOS	95.05% <100.00%> (+0.12%)	⬆️

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[martincostello]

Can you re-run dotnet mdsnippets and commit the result please?