[feature] Added a stdout sink and an env source

[edulop91]

No description provided.

[codecov-io]

Codecov Report

Merging #40 into master will decrease coverage by 1.25%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master      #40      +/-   ##
==========================================
- Coverage   28.53%   27.27%   -1.26%     
==========================================
  Files          11       12       +1     
  Lines         368      385      +17     
==========================================
  Hits          105      105              
- Misses        252      269      +17     
  Partials       11       11

Impacted Files	Coverage Δ
pkg/sink/sink.go	0% <ø> (ø)	⬆️
pkg/config/config.go	2.87% <0%> (-0.13%)	⬇️
pkg/sink/stdout.go	0% <0%> (ø)

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