fix: add get mime type safelly and make google drive deps trully optional

[AlexandreSenpai]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 52.08333% with 23 lines in your changes missing coverage. Please review.

Project coverage is 78.01%. Comparing base (35815d6) to head (c31fa6c).

Files with missing lines	Patch %	Lines
enma/infra/adapters/storage/google_drive.py	0.00%	11 Missing ⚠️
enma/infra/adapters/repositories/mangadex.py	11.11%	8 Missing ⚠️
enma/domain/utils/mime.py	66.66%	3 Missing ⚠️
enma/infra/adapters/repositories/nhentai.py	93.75%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #85      +/-   ##
==========================================
- Coverage   78.90%   78.01%   -0.90%     
==========================================
  Files          24       25       +1     
  Lines        1266     1301      +35     
==========================================
+ Hits          999     1015      +16     
- Misses        267      286      +19     

Flag	Coverage Δ
pytest	78.01% <52.08%> (-0.90%)	⬇️

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