add sample logger for parse_re2 and discard plugins

[DSmolonogov]

Fixes #259

[codecov]

Codecov Report

Base: 66.97% // Head: 67.42% // Increases project coverage by +0.45% 🎉

Coverage data is based on head (cd27594) compared to base (e592906).
Patch coverage: 83.05% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #260      +/-   ##
==========================================
+ Coverage   66.97%   67.42%   +0.45%     
==========================================
  Files          92       93       +1     
  Lines        8093     8156      +63     
==========================================
+ Hits         5420     5499      +79     
+ Misses       2296     2278      -18     
- Partials      377      379       +2     

Impacted Files	Coverage Δ
pipeline/plugin.go	82.35% <ø> (ø)
plugin/action/parse_re2/parse_re2.go	82.22% <40.00%> (-3.50%)	⬇️
plugin/action/discard/discard.go	81.25% <57.14%> (-18.75%)	⬇️
plugin/action/throttle/throttle.go	89.80% <57.14%> (+0.06%)	⬆️
pipeline/pipeline.go	66.60% <66.66%> (+0.06%)	⬆️
logger/logger.go	65.33% <100.00%> (+7.26%)	⬆️
pipeline/processor.go	89.33% <100.00%> (+0.04%)	⬆️
cfg/envs.go	82.35% <0.00%> (ø)
plugin/input/file/provider.go	63.57% <0.00%> (+1.68%)	⬆️
... and 6 more

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