Track tests in HasTests to support metadata needs

[tmckay-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?
• Did you request a desired merge strategy?
• Did you add text to be included in the Release Notes for this change?

Type of Improvement

• API modification

Desired Merge Strategy

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

Release Notes

• Refactor HasTests to track tests in buffer before elaborating
  • The use case for this is to support capturing metadata about the tests that belong to a HasTests module. At the moment, testName is the only public member of the TestParameters, but this may be expanded in the future.

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) and clean up the commit message.
  • Merge: Ensure that contributor has cleaned up their commit history, then merge with Create a merge commit.

[jackkoenig]

Marked as No Release Notes instead of API Modification because there is not yet a release with this feature.

[jackkoenig]

I don't entirely understand why you're making this change, can you explain a little bit more in the PR description?

[tmckay-sifive]

Of course, the focus here is supporting metadata, e.g. Properties. I added

The use case for this is to support capturing metadata about the tests that belong to a HasTests module. At the moment, testName is the only public member of the TestParameters, but this may be expanded in the future.

to the description and a test showing how this might be useful.