Update build, analyzers to match core Autofac

[tillig]

• Change build to GitHub Actions. This means new Autofac.Configuration packages will be published in GitHub Packages rather than on MyGet.
• Update analyzer rules to match core Autofac.
• Fix analyzer issues due to new rules.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.21%. Comparing base (4fff3f5) to head (809c2f2).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop      #47      +/-   ##
===========================================
- Coverage    73.74%   73.21%   -0.53%     
===========================================
  Files           10       10              
  Lines          358      351       -7     
  Branches       117      117              
===========================================
- Hits           264      257       -7     
  Misses          42       42              
  Partials        52       52              

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