Add support for env_prefix config setting

[dekkers]

This adds support for the env_prefix config setting by prepending the prefix to the field name.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (8e67c91) 100.00% compared to head (41da98c) 100.00%.

Additional details and impacted files

@@            Coverage Diff            @@
##              main       #29   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            2         2           
  Lines          135       135           
  Branches        31        31           
=========================================
  Hits           135       135           

Flag	Coverage Δ
integration_tests	90.37% <100.00%> (ø)
total	100.00% <100.00%> (ø)
unit_tests	64.44% <100.00%> (ø)

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[radeklat]

Thank you for an A+ pull request! 🎉 Nothing to add other than kudos for implementing this missing functionality ❤️