🎨 Enable strict type check and improve the project typing

[Ousret]

Following #182

[codecov-commenter]

Codecov Report

Merging #207 (81c9c43) into master (6155b6b) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #207   +/-   ##
=======================================
  Coverage   89.88%   89.88%           
=======================================
  Files          11       11           
  Lines        1216     1216           
=======================================
  Hits         1093     1093           
  Misses        123      123           

Impacted Files	Coverage Δ
charset_normalizer/api.py	86.76% <100.00%> (ø)
charset_normalizer/cd.py	96.34% <100.00%> (ø)
charset_normalizer/cli/normalizer.py	75.00% <100.00%> (ø)
charset_normalizer/models.py	86.66% <100.00%> (ø)
charset_normalizer/utils.py	86.17% <100.00%> (ø)

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