Add modulePorts and fullModulePorts in DataMirror for Instance

[debs-sifive]

Contributor Checklist

• Did you add Scaladoc to every public function/method?
• Did you add at least one test demonstrating the PR?
• Did you delete any extraneous printlns/debugging code?
• Did you specify the type of improvement?
• Did you add appropriate documentation in docs/src?
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• Did you add text to be included in the Release Notes for this change?

Type of Improvement

• Feature (or new API)

Desired Merge Strategy

• Squash: The PR will be squashed and merged (choose this if you have no preference).

Release Notes

Added modulePorts and fullModulePorts methods in DataMirror that returns all ports on an Instance of a module.

Reviewer Checklist (only modified by reviewer)

• Did you add the appropriate labels? (Select the most appropriate one based on the "Type of Improvement")
• Did you mark the proper milestone (Bug fix: 3.6.x, 5.x, or 6.x depending on impact, API modification or big change: 7.0)?
• Did you review?
• Did you check whether all relevant Contributor checkboxes have been checked?
• Did you do one of the following when ready to merge:
  • Squash: You/ the contributor Enable auto-merge (squash), clean up the commit message, and label with Please Merge.
  • Merge: Ensure that contributor has cleaned up their commit history, then merge with Create a merge commit.

[jackkoenig]

Looks good but please see comments on tests.

Also this is failing to generate ScalaDoc due to ambiguous links. Theoretically it's possible to disambiguate them but I find ScalaDoc to be super flakey on that so just replace the [[ and ]] around [[DataMirror.modulePorts]] with backticks and call it a day. You can reproduce the failure with sbt "unipublish / unidoc"