variable resolution fitting

[rozyczko]

Resolution Function Handling Improvements:

• Resolution functions are now associated with models and datasets rather than calculators, allowing each model and dataset to have its own resolution. The set_resolution_function method now takes a model_id, and calculators use the correct resolution for each model or dataset.
• The calculator and wrapper APIs (reflectity_profile, reflectivity_profile_channel, polarized_reflectivity_profiles, and related methods) now accept an explicit resolution_function argument, ensuring that the correct resolution is used for each calculation.

API and Internal Refactoring:

• New methods and refactored signatures in calculator base and factory classes to support per-model and per-dataset resolution, including resolution_function_for and enhanced fit function generation.
• The polarized reflectivity calculation logic in wrappers is updated to pass and use the correct resolution function throughout the computation

[codecov]

Codecov Report

❌ Patch coverage is 98.44358% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 95.03%. Comparing base (433bb4f) to head (41021d4).
⚠️ Report is 1 commits behind head on develop.

Files with missing lines	Patch %	Lines
src/easyreflectometry/project.py	96.90%	3 Missing ⚠️
src/easyreflectometry/calculators/factory.py	92.85%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #424      +/-   ##
===========================================
+ Coverage    94.86%   95.03%   +0.16%     
===========================================
  Files           55       55              
  Lines         5786     5977     +191     
===========================================
+ Hits          5489     5680     +191     
  Misses         297      297              

Flag	Coverage Δ
integration	37.27% <28.79%> (-0.51%)	⬇️
unittests	95.03% <98.44%> (+0.16%)	⬆️

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

Files with missing lines	Coverage Δ
...c/easyreflectometry/calculators/calculator_base.py	100.00% <100.00%> (ø)
...rc/easyreflectometry/calculators/refl1d/wrapper.py	97.46% <100.00%> (+0.02%)	⬆️
src/easyreflectometry/calculators/refnx/wrapper.py	100.00% <100.00%> (ø)
src/easyreflectometry/calculators/wrapper_base.py	100.00% <100.00%> (ø)
src/easyreflectometry/data/__init__.py	100.00% <100.00%> (ø)
src/easyreflectometry/data/data_store.py	100.00% <100.00%> (ø)
src/easyreflectometry/data/measurement.py	96.29% <100.00%> (+1.79%)	⬆️
src/easyreflectometry/fitting.py	99.48% <100.00%> (+0.04%)	⬆️
src/easyreflectometry/model/model.py	98.10% <100.00%> (-0.03%)	⬇️
...rc/easyreflectometry/model/resolution_functions.py	98.21% <100.00%> (+0.17%)	⬆️
... and 2 more

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