Add Instance.suggestName (backport #2886)

[mergify]

This is an automatic backport of pull request #2886 done by Mergify.

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Original PR Body

Status: instance names are colliding, causing the new tests 11.3 and 11.4 to fail. Need to figure that out and fix it.

This supersedes #2414, which I think is abandoned. Resolves #2366.

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 state the API impact?
• Did you specify the code generation impact?
• Did you request a desired merge strategy?
• Did you add text to be included in the Release Notes for this change?

Type of Improvement

• new feature/API

API Impact

Adds suggestName API for hierarchy instances.

Backend Code Generation Impact

Allows users to control Verilog module instance names.

Desired Merge Strategy

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

Release Notes

Adds suggestName API for hierarchy instances.

Reviewer Checklist (only modified by reviewer)

• Did you add the appropriate labels?
• Did you mark the proper milestone (Bug fix: 3.4.x, [small] API extension: 3.5.x, API modification or big change: 3.6.0)?
• 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.

[linux-foundation-easycla]

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• ✅ login: jackkoenig / name: Jack Koenig (c9b1bae)