Provide ImplicitClock and ImplicitReset (backport #3714)

[mergify]

This is an automatic backport of pull request #3714 done by Mergify.

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Original PR Body

This also deleted a long-deprecated protected method that didn't do anything.

• TODO add an example to the mdoc

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

• Feature (or new API)

Desired Merge Strategy

• Squash

Release Notes

These traits implement the functionality formerly only implemented in Module such that they can now be used by RawModules. They also define new protected virtual methods implicitClock and implicitReset that can be overridden within Module to change what values are used as the implicit clock and implicit reset respectively.

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: 3.5.x, 3.6.x, or 5.x depending on impact, API modification or big change: 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.