precommit: add typos check & fixing some

[Borda]

let's get rid of some typos and prevent adding new ones 🦉

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (eea7a24) 99.40% compared to head (d50b39f) 99.40%.
Report is 3 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #153   +/-   ##
=======================================
  Coverage   99.40%   99.40%           
=======================================
  Files           5        5           
  Lines         508      508           
  Branches       88       88           
=======================================
  Hits          505      505           
  Misses          2        2           
  Partials        1        1           

Files	Coverage Δ
cachier/base_core.py	100.00% <ø> (ø)
cachier/pickle_core.py	100.00% <ø> (ø)

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