ENH: added an optional css id to <table> tags created by to_html()

[samghelms]

This is useful for the reasons mentioned in #8496

• closes Add table id option to pandas.DataFrame.to_html  #8496
• tests added / passed: test_to_html_with_id
• passes git diff upstream/master -u -- "*.py" | flake8 --diff
• whatsnew entry

[pep8speaks]

Hello @samghelms! Thanks for updating the PR.

• In the file pandas/core/frame.py, following are the PEP8 issues :

Line 1763:76: W291 trailing whitespace

• In the file pandas/io/formats/format.py, following are the PEP8 issues :

Line 750:47: E251 unexpected spaces around keyword / parameter equals
Line 750:49: E251 unexpected spaces around keyword / parameter equals

• In the file pandas/tests/io/formats/test_format.py, following are the PEP8 issues :

Line 1494:18: E211 whitespace before '('

• In the file pandas/tests/io/formats/test_to_html.py, following are the PEP8 issues :

Line 1874:1: W391 blank line at end of file

[codecov]

Codecov Report

Merging #19591 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master   #19591      +/-   ##
==========================================
+ Coverage   91.62%   91.62%   +<.01%     
==========================================
  Files         150      150              
  Lines       48780    48785       +5     
==========================================
+ Hits        44693    44698       +5     
  Misses       4087     4087

Flag	Coverage Δ
#multiple	89.99% <100%> (ø)	⬆️
#single	41.73% <33.33%> (-0.01%)	⬇️

Impacted Files	Coverage Δ
pandas/core/frame.py	97.42% <100%> (ø)	⬆️
pandas/io/formats/format.py	96.25% <100%> (ø)	⬆️

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