quantify xarray parameters in MathematicalExpression

[CagtayFabry]

Changes

• quantify unitless xarray input parameters as dimensionless in MathematicalExpression (same as non quantity numeric inputs)
• update pint-xarray dependency to 0.3 for updated pint.quantify() behavior

Related Issues

Closes #860

Checks

• updated CHANGELOG.rst
• updated tests

[github-actions]

Test Results

2 189 tests  +2   2 188 ✔️ +2   3m 47s ⏱️ + 1m 9s
       1 suites ±0          1 💤 ±0 
       1 files   ±0          0 ❌ ±0 

Results for commit 0f7d096. ± Comparison against base commit 91140eb.

[codecov]

Codecov Report

Merging #864 (0f7d096) into master (91140eb) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #864      +/-   ##
==========================================
+ Coverage   96.47%   96.49%   +0.01%     
==========================================
  Files          95       95              
  Lines        6238     6242       +4     
==========================================
+ Hits         6018     6023       +5     
+ Misses        220      219       -1     

Impacted Files	Coverage Δ
weldx/core/math_expression.py	98.59% <100.00%> (+0.08%)	⬆️

... and 1 file with indirect coverage changes

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