New Calculator factory (separate from NewCollectionBase)

[rozyczko]

Implements architecture decision from Discussion #160:

• Add CalculatorBase: Abstract base class for physics calculators
• Add CalculatorFactoryBase: Abstract factory for creating calculator instances
• Add SimpleCalculatorFactory: Concrete factory using dictionary registry
• Add deprecation warning to InterfaceFactoryTemplate
• Make Map._store private (__store) to enforce encapsulation
• Update parameter.py to use public API instead of private _store access
• Add comprehensive unit tests for all new classes

[github-actions]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.64%. Comparing base (bd10653) to head (e3fe4f9).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #181      +/-   ##
===========================================
+ Coverage    81.15%   81.64%   +0.49%     
===========================================
  Files           52       54       +2     
  Lines         4267     4381     +114     
  Branches       740      751      +11     
===========================================
+ Hits          3463     3577     +114     
  Misses         624      624              
  Partials       180      180              

Flag	Coverage Δ
unittests	81.64% <100.00%> (+0.49%)	⬆️

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Files with missing lines	Coverage Δ
src/easyscience/fitting/calculators/__init__.py	100.00% <100.00%> (ø)
...easyscience/fitting/calculators/calculator_base.py	100.00% <100.00%> (ø)
...yscience/fitting/calculators/calculator_factory.py	100.00% <100.00%> (ø)
...syscience/fitting/calculators/interface_factory.py	94.59% <100.00%> (+0.09%)	⬆️
src/easyscience/global_object/map.py	96.92% <100.00%> (ø)
src/easyscience/variable/parameter.py	90.50% <100.00%> (+0.01%)	⬆️

[rozyczko]

Issues brought up in #172 addressed