Add table_id argument

[eutwt]

This PR adds the table_id argument to compare(), with a slightly different approach than #34. The functions which take a comparison argument all use the comparison's table_id, rather than having their own argument to specify table identifiers.

@elipousson Thanks for the feature request and initial implementation! Could you let me know what you think of this approach?

Edit: On second thought, the suffix argument was a good idea. So this PR is now the same approach on the user end as yours. The only real difference with yours is I kept things as "a" and "b" for steps if they were entirely internal (locate_matches), and handled some rare edge cases like a suffix vector where both values are the same.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (1da3111) to head (8533058).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main       #36   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
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  Files            8         8           
  Lines          394       439   +45     
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+ Hits           394       439   +45     

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[elipousson]

This looks great! I'll test it as soon as I get a chance and be sure to report back if I can any unexpected issues. Thanks for being open to the contribution.