Add name property to ModelComponents, DiffusionModels and ComponentCollections

[henrikjacobsenfys]

This is needed for migrating to using EasyList #117 #70

[codecov]

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##             develop     #178   +/-   ##
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  Coverage           ?   98.18%           
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  Files              ?       47           
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  Hits               ?     3083           
  Misses             ?       35           
  Partials           ?       22           

Flag	Coverage Δ
integration	45.98% <45.23%> (?)
unittests	98.18% <100.00%> (?)

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[rozyczko]

• ComponentCollection.__init__ still has display_name defaulting to a string, which is inconsistent with the rest, where it defaults to None (or name)

• DiffusionModelBase has a separate __repr__ that doesn't include name

[rozyczko]

EasyDynamicsModelBase.__init__ already calls self._unit = _validate_unit(unit), so the second assignment overwrites it without validation. It's better to remove this assignment entirely.

[henrikjacobsenfys]

@rozyczko would you give a quick thumbs up? :)