✨ NEW: Add attrs_plugin

[chrisjsewell]

Add attributes to self-closing inline elements:
![alt](https://image.com){#id .a b=c}

[codecov]

Codecov Report

Base: 93.18% // Head: 92.09% // Decreases project coverage by -1.09% ⚠️

Coverage data is based on head (d564b63) compared to base (6fbc43f).
Patch coverage: 83.88% of modified lines in pull request are covered.

❗ Current head d564b63 differs from pull request most recent head 8dbb801. Consider uploading reports for the commit 8dbb801 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #50      +/-   ##
==========================================
- Coverage   93.18%   92.09%   -1.10%     
==========================================
  Files          24       27       +3     
  Lines        1350     1530     +180     
==========================================
+ Hits         1258     1409     +151     
- Misses         92      121      +29     

Flag	Coverage Δ
pytests	92.09% <83.88%> (-1.10%)	⬇️

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Impacted Files	Coverage Δ
mdit_py_plugins/attrs/parse.py	83.54% <83.54%> (ø)
mdit_py_plugins/attrs/index.py	85.71% <85.71%> (ø)
mdit_py_plugins/attrs/__init__.py	100.00% <100.00%> (ø)

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