Disable introspection by default on non dev environments

[michaelstaib]

• Schema middleware caches now the SDL per version
• Schema middleware adds caching headers
• Introduces new route for schema /graphql/schema.graphql
• Allows to disable schema middleware with request options
• Disables introspection when NON dev environment is detected
• Introduces ISchemaDocumentFormatter so components can reformat the public schema file.

[codecov]

Codecov Report

Attention: Patch coverage is 93.56725% with 11 lines in your changes missing coverage. Please review.

Project coverage is 77.18%. Comparing base (a88692f) to head (38fced8).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...Core/Serialization/DefaultHttpResponseFormatter.cs	86.30%	10 Missing ⚠️
...pNetCore/src/AspNetCore/HttpGetSchemaMiddleware.cs	96.87%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7430      +/-   ##
==========================================
- Coverage   78.87%   77.18%   -1.70%     
==========================================
  Files        2445     2820     +375     
  Lines      120346   141357   +21011     
==========================================
+ Hits        94927   109110   +14183     
- Misses      25419    32247    +6828     

Flag	Coverage Δ
unittests	77.18% <93.56%> (-1.70%)	⬇️

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