Prepare ophys metadata for dict-based format

[h-mayorquin]

Preparation for the ophys metadata restructuring described in PR #1653.

Removes deprecated wrapper functions from roiextractors_pending_deprecation.py (March 2026 deadline). Adds keyword-only parameter enforcement to add_imaging_to_nwbfile via *args with FutureWarning. Renames internal functions with _old_list_format / _old_metadata_list suffixes to make it explicit that they operate on the current list-based metadata format.

[pauladkisson]

Looks good to me!

[codecov]

Codecov Report

❌ Patch coverage is 63.88889% with 13 lines in your changes missing coverage. Please review.
✅ Project coverage is 81.01%. Comparing base (c7f0869) to head (3b5d576).
⚠️ Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
src/neuroconv/tools/roiextractors/roiextractors.py	55.17%	13 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1680      +/-   ##
==========================================
+ Coverage   80.23%   81.01%   +0.78%     
==========================================
  Files         160      160              
  Lines       12663    12471     -192     
==========================================
- Hits        10160    10104      -56     
+ Misses       2503     2367     -136     

Flag	Coverage Δ
unittests	81.01% <63.88%> (+0.78%)	⬆️

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

Files with missing lines	Coverage Δ
...rfaces/ophys/basesegmentationextractorinterface.py	79.31% <100.00%> (ø)
...tainterfaces/ophys/miniscope/miniscopeconverter.py	95.23% <100.00%> (ø)
...s/ophys/miniscope/miniscopeimagingdatainterface.py	78.04% <100.00%> (ø)
src/neuroconv/tools/roiextractors/__init__.py	100.00% <ø> (ø)
...roiextractors/roiextractors_pending_deprecation.py	87.50% <100.00%> (+51.37%)	⬆️
src/neuroconv/tools/roiextractors/roiextractors.py	75.18% <55.17%> (-1.78%)	⬇️

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