Renames model.rebuild variables, updates import structure, adds type-hints to BaseModel

[BradyPlanden]

Description

1. Renames model.matched_parameters -> model.rebuild_parameters and model.non_matched_parameters -> model.standard_parameters for better user comprehension. The previous model.rebuild_parameters is likewise renamed to model.geometric_parameters
2. Updates the import structure to avoid circular references when adding type-hints and reduces class imports.
3. Adds type-hints to BaseModel where possible
4. Moves the _handle_special_cases() method into ECM to remove circular reference
5. Adds setitem and getitem to pybop.ParameterSet

Issue reference

Fixes # (issue-number)

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[codecov]

Codecov Report

Attention: Patch coverage is 98.58156% with 2 lines in your changes missing coverage. Please review.

Project coverage is 97.07%. Comparing base (ce1cb54) to head (1020428).
Report is 605 commits behind head on develop.

Files with missing lines	Patch %	Lines
pybop/_dataset.py	75.00%	1 Missing ⚠️
pybop/parameters/parameter_set.py	88.88%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #315      +/-   ##
===========================================
- Coverage    97.20%   97.07%   -0.13%     
===========================================
  Files           45       41       -4     
  Lines         2612     2328     -284     
===========================================
- Hits          2539     2260     -279     
+ Misses          73       68       -5     

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[NicolaCourtier]

Thanks @BradyPlanden, great to see all the type hints! I think we can now update parameters from Dict to Parameters type.