feat: add kafka-replica-verification command (closes #2)

[devshawn]

Description

Adds support for the command kafka-replica-verification.

[codecov-io]

Codecov Report

Merging #9 into master will increase coverage by 0.03%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master      #9      +/-   ##
=========================================
+ Coverage   96.66%   96.7%   +0.03%     
=========================================
  Files          12      12              
  Lines         540     546       +6     
=========================================
+ Hits          522     528       +6     
  Misses         18      18

Impacted Files	Coverage Δ
kafkashell/executor.py	100% <100%> (ø)	⬆️
kafkashell/constants.py	100% <100%> (ø)	⬆️

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