Release version 0.23.6

[JiriPavela]

• Fix issue with empty CLI stats headers
• Implement lazy loading of the most expensive internal packages to speedup Perun and make CLI snappier

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.96%. Comparing base (2ec3930) to head (fa10e84).
Report is 2 commits behind head on devel.

Additional details and impacted files

@@           Coverage Diff           @@
##            devel     #261   +/-   ##
=======================================
  Coverage   98.96%   98.96%           
=======================================
  Files         158      158           
  Lines       10812    10812           
=======================================
  Hits        10700    10700           
  Misses        112      112           

Flag	Coverage Δ
coverage-3.10	98.95% <ø> (-0.01%)	⬇️
coverage-3.11	98.96% <ø> (ø)
coverage-3.12	98.95% <ø> (ø)
coverage-3.9	98.93% <ø> (ø)

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