fix: ensure HTML ID attributes are unique

[BenGale93]

Summary

Previously, if you had multiple GT HTML tables inside a single document, that had column names in common, you would have repeated HTML ID attributes. This PR makes these ID attributes unique by prepending the table ID, if it exists.

Related GitHub Issues and PRs

• Ref: Use of ID attributes #594

Checklist

• I understand and agree to the Code of Conduct.
• I have followed the Style Guide for Python Code as best as possible for the submitted code.
• I have added pytest unit tests for any new functionality.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.72%. Comparing base (3d6ad09) to head (6635b4b).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #607   +/-   ##
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  Coverage   90.71%   90.72%           
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  Files          46       46           
  Lines        5417     5422    +5     
=======================================
+ Hits         4914     4919    +5     
  Misses        503      503           

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[rich-iannone]

This looks great, thanks! However, it looks like the formatting used for the new ID values shouldn't have a space. According to a W3Schools page:

The id name must contain at least one character, cannot start with a number, and must not contain whitespaces (spaces, tabs, etc.).

Could you revise to use a hyphen instead?

[BenGale93]

Just updated it. I also applied the same rule to the column label and updated the test to have a column with a space in the name to demonstrate that.