feat: include the Response object in NextcloudException

[kyteinsky]

Fixes # .

Changes proposed in this pull request:

• Include the Response object for the downstream apps can get the full error response and anything else in the object.

[codecov]

Codecov Report

❌ Patch coverage is 90.00000% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 94.65%. Comparing base (7ebe4c3) to head (7871751).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
nc_py_api/files/_files.py	0.00%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #394   +/-   ##
=======================================
  Coverage   94.65%   94.65%           
=======================================
  Files          45       45           
  Lines        5389     5392    +3     
=======================================
+ Hits         5101     5104    +3     
  Misses        288      288           

Files with missing lines	Coverage Δ
nc_py_api/_exceptions.py	100.00% <100.00%> (ø)
nc_py_api/_session.py	94.73% <100.00%> (ø)
nc_py_api/files/_files.py	98.65% <0.00%> (ø)

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[oleksandr-nc]

Well-implemented, backward-compatible enhancement 👍