Add cache headers for ReDoc and SwaggerUI

[martincostello]

• Embed the versions of redoc and swagger-ui-dist into their respective assemblies as [AssemblyMetdata] attributes.
• Remove redundant GetTypeInfo() calls.
• Add cache headers to ReDoc and SwaggerUI static files.

Resolves #3336.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 84.37500% with 10 lines in your changes missing coverage. Please review.

Project coverage is 83.28%. Comparing base (37a50bc) to head (6ee97f1).
Report is 14 commits behind head on master.

Files with missing lines	Patch %	Lines
...rc/Swashbuckle.AspNetCore.ReDoc/ReDocMiddleware.cs	83.33%	5 Missing ⚠️
...buckle.AspNetCore.SwaggerUI/SwaggerUIMiddleware.cs	83.33%	5 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3341      +/-   ##
==========================================
- Coverage   84.56%   83.28%   -1.29%     
==========================================
  Files          84       84              
  Lines        3227     3285      +58     
  Branches      563      567       +4     
==========================================
+ Hits         2729     2736       +7     
- Misses        498      549      +51     

Flag	Coverage Δ
Linux	83.28% <84.37%> (+17.43%)	⬆️
Windows	83.28% <84.37%> (+17.43%)	⬆️
macOS	83.28% <84.37%> (-0.01%)	⬇️

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