Name the targets of identity views (backport #4222)

[mergify]

I'm calling this a bugfix because it fixes an issue exacerbated by #4198, but it's also sort of a feature. The crux of the motivation for this change is visible in the change to VecSpec. Basically, if the user returns a view in lieu of the underlying target Data, the actual Data does not currently get named. This PR fixes it by having identity views forward their naming on to the underlying target. This PR is made much more important by #4198 because this now comes up quite a bit in user code, VecSpec showing an example.

Future work is handling non-identity views because it is reasonable to forward naming in those cases as well, but perhaps with additional prefixing based on the "local" name of the target within the view Aggregate.

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)
• Bugfix

Desired Merge Strategy

• Squash

Release Notes

Reviewer Checklist (only modified by reviewer)

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• 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)?
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• Did you do one of the following when ready to merge:
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This is an automatic backport of pull request #4222 done by [Mergify](https://mergify.com).