Configuration controlled via environment variables

[ghost]

• Creating flagz package that extends standard flag package.
• Can expand to cloud specific flags in the future.
• closes #33

[codecov[bot]]

Codecov Report

Merging #34 (08e0d9d) into main (6311613) will increase coverage by 3.52%. The diff coverage is 84.84%.

@@           Coverage Diff            @@
##            main     #34      +/-   ##
========================================
+ Coverage   3.71%   7.23%   +3.52%     
========================================
  Files          8       9       +1     
  Lines        727     760      +33     
========================================
+ Hits          27      55      +28     
- Misses       698     703       +5     
  Partials       2       2              

Impacted Files	Coverage Δ
internal/flagz/flagz.go	84.84% <84.84%> (ø)

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