Enable deepcopy for ExpData(View)

[dweindl]

Fixes a bug in SwigPtrView.__deepcopy__ which did not produce a deep copy.

Add SwigPtrView.__eq__ to allow for comparison. The view objects are considered equal if the underlying viewed objects are equal.

Fixes #2189.

[codecov]

Codecov Report

Merging #2196 (f82b1b5) into develop (187362a) will increase coverage by 0.01%.
The diff coverage is 80.00%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2196      +/-   ##
===========================================
+ Coverage    76.62%   76.63%   +0.01%     
===========================================
  Files           82       82              
  Lines        15008    15012       +4     
===========================================
+ Hits         11500    11505       +5     
+ Misses        3508     3507       -1     

Flag	Coverage Δ
cpp	73.53% <ø> (-0.04%)	⬇️
petab	53.80% <20.00%> (-0.03%)	⬇️
python	77.23% <80.00%> (+0.08%)	⬆️
sbmlsuite	?

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Files	Coverage Δ
python/sdist/amici/numpy.py	85.98% <80.00%> (+4.42%)	⬆️

... and 1 file with indirect coverage changes