add dataclass_nested_eq decorator

[CagtayFabry]

Changes

This adds the util.dataclass_nested_eq decorator to simplify defining __eq__ on datacalsses that have array-like fileds such as np.ndarray, xarray.DataArray etc.

Related Issues

Checks

• updated CHANGELOG.md
• updated tests
• updated doc/
• update example/tutorial notebooks

[codecov]

Codecov Report

Merging #378 (e4409b8) into master (f2dcc43) will decrease coverage by 0.05%.
The diff coverage is 62.50%.

@@            Coverage Diff             @@
##           master     #378      +/-   ##
==========================================
- Coverage   97.61%   97.56%   -0.06%     
==========================================
  Files          86       86              
  Lines        5368     5376       +8     
==========================================
+ Hits         5240     5245       +5     
- Misses        128      131       +3     

Impacted Files	Coverage Δ
weldx/util.py	98.23% <57.14%> (-0.74%)	⬇️
weldx/geometry.py	99.55% <100.00%> (+<0.01%)	⬆️

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[vhirtham]

Nice one