Add type hints to complete developer interface

[mawassk]

No description provided.

[codecov]

Codecov Report

Merging #7 (152c627) into main (3ab2307) will decrease coverage by 0.97%.
The diff coverage is 77.77%.

@@            Coverage Diff             @@
##             main       #7      +/-   ##
==========================================
- Coverage   93.71%   92.73%   -0.98%     
==========================================
  Files           7        7              
  Lines         175      179       +4     
==========================================
+ Hits          164      166       +2     
- Misses         11       13       +2     

Impacted Files	Coverage Δ
ninja_apikey/models.py	95.83% <ø> (ø)
ninja_apikey/security.py	79.54% <71.42%> (-2.96%)	⬇️
ninja_apikey/admin.py	88.00% <100.00%> (ø)

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