Extract environment access class

[c-w]

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[codecov-io]

Codecov Report

Merging #104 into master will increase coverage by 0.13%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #104      +/-   ##
==========================================
+ Coverage   91.26%   91.39%   +0.13%     
==========================================
  Files          20       21       +1     
  Lines         824      837      +13     
==========================================
+ Hits          752      765      +13     
  Misses         72       72

Impacted Files	Coverage Δ
opwen_email_server/utils/env.py	100% <100%> (ø)
opwen_email_server/config.py	95% <100%> (ø)	⬆️

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