Add to_dict and from_dict methods to Labware

[michaelosthege]

Goals

• Make it easy to serialize labware to dictionaries of only atomic types (no NumPy arrays) and to re-instantiate labware from such dicts.
• Make Labware.from_dict also work for recreating Trough labware based on the data.

Implementation details

Trough types have different __init__ parameters (rows vs. virtual_rows) just like derived types can have different init parameters or attributes.

I implemented _from_dict_init_kwargs and _from_dict_attributes which can be overriden by derived types to account for customization.

Some (hopefully) clever logic was necessary to support buffers_trough = Labware.from_dict(data) returning Trough objects even if that does not give a definite type hint.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.85%. Comparing base (0391cde) to head (00aa3a7).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #113      +/-   ##
==========================================
+ Coverage   95.74%   95.85%   +0.10%     
==========================================
  Files          19       19              
  Lines        1198     1229      +31     
==========================================
+ Hits         1147     1178      +31     
  Misses         51       51              

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