Create base class

[henrikjacobsenfys]

Moves unit to a base class to centralize checks.

Also (re)introduces a name property that will replace unique_name for the users and make it easier to work with components by inheriting from EasyList. (see #117 and #70 )

Closes #92
Closes #73 as redundant

[codecov]

Codecov Report

❌ Patch coverage is 97.53086% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 97.82%. Comparing base (95c2018) to head (46a6823).

Files with missing lines	Patch %	Lines
src/easydynamics/sample_model/model_base.py	88.88%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #144      +/-   ##
===========================================
- Coverage    97.84%   97.82%   -0.03%     
===========================================
  Files           38       41       +3     
  Lines         2595     2616      +21     
  Branches       452      454       +2     
===========================================
+ Hits          2539     2559      +20     
- Misses          32       34       +2     
+ Partials        24       23       -1     

Flag	Coverage Δ
integration	48.73% <56.79%> (+0.18%)	⬆️
unittests	97.82% <97.53%> (-0.03%)	⬇️

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