Container EnvDefault

[niden]

Adding EnvDefault in the lazy container resolvers to allow for a default value to be available when an env variable does not exist.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 77.37%. Comparing base (766cb41) to head (93d6848).
⚠️ Report is 2 commits behind head on v6.0.x.

Additional details and impacted files

@@           Coverage Diff           @@
##           v6.0.x     #744   +/-   ##
=======================================
  Coverage   77.36%   77.37%           
=======================================
  Files         505      506    +1     
  Lines       29051    29060    +9     
=======================================
+ Hits        22476    22485    +9     
  Misses       6575     6575           

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