Support for non-default dataclass fields

[waszil]

Hi, this PR tries to fix this issue: https://github.com/astropy/sphinx-automodapi/issues/115. Used sphinx version: 3.2.1 Python version: 3.8.5

Fix #115

[simaoafonso-pwt]

This is small change, any reason why this is not merged?

[bsipocz]

This looks all fine, but needs a rebase and some minor renames/etc. I'll go ahead and do it, and see how CI reacts.

[codecov[bot]]

Codecov Report

Merging #116 (91f6fc5) into main (8b2dbcf) will decrease coverage by 0.45%. The diff coverage is 68.96%.

@@            Coverage Diff             @@
##             main     #116      +/-   ##
==========================================
- Coverage   89.83%   89.38%   -0.45%     
==========================================
  Files          27       27              
  Lines        1141     1168      +27     
==========================================
+ Hits         1025     1044      +19     
- Misses        116      124       +8     

Impacted Files	Coverage Δ
sphinx_automodapi/automodsumm.py	84.02% <20.00%> (-1.70%)	:arrow_down:
sphinx_automodapi/autodoc_enhancements.py	96.55% <88.88%> (-3.45%)	:arrow_down:
...hinx_automodapi/tests/test_autodoc_enhancements.py	96.66% <100.00%> (+1.66%)	:arrow_up:

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