Fix #1143

[h-mayorquin]

This change addresses issues like bug #1114.

The core problem lies in the risk of creating a new interface without adhering to the implicit contract for importing extensions during initialization. This PR eliminates the possibility of unintentionally introducing subtle, hard-to-detect bugs. Furthermore, as highlighted in #1143, the logic without a context manager is simpler to understand and covers approximately 95% of use cases.

[codecov]

Codecov Report

Attention: Patch coverage is 39.13043% with 14 lines in your changes missing coverage. Please review.

Project coverage is 90.08%. Comparing base (96dfdff) to head (980ca72).
Report is 22 commits behind head on main.

Files with missing lines	Patch %	Lines
src/neuroconv/basedatainterface.py	41.66%	7 Missing ⚠️
src/neuroconv/nwbconverter.py	36.36%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1180      +/-   ##
==========================================
- Coverage   90.69%   90.08%   -0.61%     
==========================================
  Files         129      129              
  Lines        8189     8311     +122     
==========================================
+ Hits         7427     7487      +60     
- Misses        762      824      +62     

Flag	Coverage Δ
unittests	90.08% <39.13%> (-0.61%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
...c/neuroconv/tools/testing/data_interface_mixins.py	95.65% <ø> (+0.09%)	⬆️
src/neuroconv/basedatainterface.py	80.00% <41.66%> (-15.35%)	⬇️
src/neuroconv/nwbconverter.py	83.21% <36.36%> (-11.75%)	⬇️

... and 17 files with indirect coverage changes