Peo 7674 add datatables

[pfoster-youitv]

• updated pydocs description for Step and Step.add_line
• added datatable property
• init'ed datatable property
• modified add_line to check the line, if it starts and ends with a pipe | then we split the internals on the | and append that to the datatable property

Needs to be tested and confirmed to work.

[codecov]

Codecov Report

Base: 95.43% // Head: 95.44% // Increases project coverage by +0.01% 🎉

Coverage data is based on head (eda82ce) compared to base (0ec8b7e).
Patch coverage: 96.38% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #596      +/-   ##
==========================================
+ Coverage   95.43%   95.44%   +0.01%     
==========================================
  Files          49       49              
  Lines        1751     1821      +70     
  Branches      189      163      -26     
==========================================
+ Hits         1671     1738      +67     
- Misses         53       55       +2     
- Partials       27       28       +1     

Impacted Files	Coverage Δ
src/pytest_bdd/parser.py	97.78% <90.32%> (-1.25%)	⬇️
src/pytest_bdd/scenario.py	93.08% <100.00%> (+0.07%)	⬆️
tests/feature/test_tags.py	100.00% <100.00%> (ø)
tests/feature/test_gherkin_terminal_reporter.py	100.00% <0.00%> (ø)

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[blaisep]

@pfoster-youitv
#378 (comment)