feat: add typechecking to profile report

[alexbarros]

closes issue #1134

[codecov-commenter]

Codecov Report

Base: 90.89% // Head: 90.90% // Increases project coverage by +0.00% 🎉

Coverage data is based on head (8f2b869) compared to base (acaa171).
Patch coverage: 100.00% of modified lines in pull request are covered.

❗ Current head 8f2b869 differs from pull request most recent head 77e4342. Consider uploading reports for the commit 77e4342 to get more accurate results

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #1139   +/-   ##
========================================
  Coverage    90.89%   90.90%           
========================================
  Files          178      178           
  Lines         5086     5090    +4     
========================================
+ Hits          4623     4627    +4     
  Misses         463      463           

Flag	Coverage Δ
py3.8-ubuntu-latest-pandas	90.90% <100.00%> (+<0.01%)	⬆️

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Impacted Files	Coverage Δ
src/pandas_profiling/profile_report.py	80.99% <100.00%> (+0.17%)	⬆️
src/pandas_profiling/visualisation/plot.py	86.69% <100.00%> (+0.11%)	⬆️

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[aquemy]

Just one comment: did you check that everything is properly annotated in the code?

[aquemy]

@alexbarros it is possible to link a PR directly :)