[feat] Explainable state modified node comparisons

[z3z1ma]

resolves #7109

Description

Spike to try updating node comparisons to leverage an object with a __bool__ method that additionally carries requisite data to log detailed diffs during state based node selection.

Checklist

• I have read the contributing guide and understand what's expected of me
• I have signed the CLA
• I have run this code in development and it appears to resolve the stated issue
• This PR includes tests, or tests are not required/relevant for this PR
• I have opened an issue to add/update docs, or docs changes are not required/relevant for this PR
• I have run changie new to create a changelog entry

[gshank]

Because of a number of changes to nodes.py and because we're in the middle of removing the old metric code, this PR is in a difficult to resolve state. Also the same_contents method has switched to doing "|" between the different checks, which is different behavior and might be breaking, so I'm thinking we don't want to do that at this time. The comparison improvements do look valuable, however. My suggestion would be to wait a bit until the metric switchover is a bit farther along, and then update this (removing the switch to "|" and try to get this included in 1.6.

[z3z1ma]

Makes sense to me. We can close this out and I can follow up after the release with a new PR with fresh eyes.
cc: @gshank

[jtcohen6]

Thanks @z3z1ma @gshank! For what it's worth - this is still a really cool idea, and I'd love to keep making progress toward it (for v1.7 if not for v1.6)

I'm going to close the PR for housekeeping purposes for now