Make libcint interface optional

[marvinfriede]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 80.00000% with 27 lines in your changes missing coverage. Please review.

Project coverage is 82.69%. Comparing base (4562481) to head (35d5fc2).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/dxtb/_src/calculators/types/abc.py	85.18%	12 Missing ⚠️
src/dxtb/_src/calculators/config/integral.py	60.00%	4 Missing and 2 partials ⚠️
src/dxtb/_src/exlibs/available.py	62.50%	6 Missing ⚠️
src/dxtb/_src/integral/wrappers.py	66.66%	1 Missing and 1 partial ⚠️
src/dxtb/_src/calculators/types/autograd.py	87.50%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #166      +/-   ##
==========================================
+ Coverage   82.14%   82.69%   +0.54%     
==========================================
  Files         194      195       +1     
  Lines        9628     9706      +78     
  Branches     1460     1465       +5     
==========================================
+ Hits         7909     8026     +117     
+ Misses       1358     1329      -29     
+ Partials      361      351      -10     

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