Load Alchemy's config.yml before app initializers

[mamhoff]

Load Alchemy configuration from YAML files
in config/alchemy/config.yml and config/alchemy/#{Rails.env}.config.yml f they exist.
This has to be done before any app initializers are loaded, so that the configuration is available in all initializers.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.78%. Comparing base (6c8538f) to head (c865f40).
Report is 6 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3229   +/-   ##
=======================================
  Coverage   96.78%   96.78%           
=======================================
  Files         265      265           
  Lines        6720     6720           
=======================================
  Hits         6504     6504           
  Misses        216      216           

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