👌 IMPROVE: AMSmath defaut HTML tags

[rowanc1]

Changed the default rendering to: <div class="math amsmath">{content}</div>.

Added some tests to cover more realistic AMS math scenarios.

See also:
executablebooks/markdown-it-amsmath#4
executablebooks/markdown-it-amsmath#1

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[codecov]

Codecov Report

Merging #27 (bbcb101) into master (a0f7ffa) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master      #27   +/-   ##
=======================================
  Coverage   93.41%   93.41%           
=======================================
  Files          24       24           
  Lines        1215     1215           
=======================================
  Hits         1135     1135           
  Misses         80       80           

Flag	Coverage Δ
pytests	93.41% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
mdit_py_plugins/amsmath/__init__.py	95.45% <100.00%> (ø)

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