feat: adds typing

[kushaldas]

Now we have typing information added to the project and also enabled checking in CI.

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 98.54369% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 91.29%. Comparing base (1ff2114) to head (e004840).
⚠️ Report is 12 commits behind head on master.

Files with missing lines	Patch %	Lines
pkcs11/util/rsa.py	62.50%	3 Missing ⚠️
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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #223      +/-   ##
==========================================
+ Coverage   90.17%   91.29%   +1.12%     
==========================================
  Files          15       15              
  Lines        2625     2678      +53     
  Branches       29       29              
==========================================
+ Hits         2367     2445      +78     
+ Misses        255      230      -25     
  Partials        3        3              

Flag	Coverage Δ
unittests	91.29% <98.54%> (+1.12%)	⬆️

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