refactor: remove sallust dependency

[denopink]

• removed sallust dependency
• removed config.Logger == nil checks and they'll be replaced with client config options in the near future

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.29%. Comparing base (e259449) to head (6edbd7e).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #274   +/-   ##
=======================================
  Coverage   83.29%   83.29%           
=======================================
  Files          19       19           
  Lines         808      808           
=======================================
  Hits          673      673           
  Misses        117      117           
  Partials       18       18           

Flag	Coverage Δ
unittests	83.29% <100.00%> (ø)

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