feat: Add html coverage reporting

[cameron-jobber]

Adds HTML coverage reports to the reports generated by this tool.

[jcw-]

wow! this is great - I think this is reasonable, just needs:

• a way to specify which reports are generated, probably an array of report types would work well?
• I think you'll need to specify both the input file AND the output directory in the reporting method

[cameron-jobber]

@jcw- I've done one pass of changes per your comments.

a way to specify which reports are generated, probably an array of report types would work well?

I haven't done this yet. Do you mean something like input arguments/options? or config options? or both? or something else?

[jcw-]

Thanks, looks good - just one more requested change (a config option)!

[jcw-]

Will do some testing on this soon, also one more thought...

[cameron-jobber]

Will do some testing on this soon, also one more thought...

@jcw- If you wanted to see this change in action, I've enabled it on this PR. You can see the coverage report (you were right!) in the 'Artifacts' tab here.