FR: adjust colors for custom rev-sets about jj HOT 2 OPEN

I have something pretty similar to this in my config which might help. I like to know what commits are on a branch at a glance, so I made commits in immutable_heads()..branches() have an unfilled diamond icon instead of the default circle. The actual revset check is in a separate template-alias called in_branch(commit). Adding color could probably be achieved with the label() template function around the node icon.

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This is currently not easily doable, but it is doable in a complicated fashion (I think) by combining the contained_in template from https://martinvonz.github.io/jj/prerelease/templates/#commit-type and the log node template from https://martinvonz.github.io/jj/prerelease/config/#node-style. Update: See also Scott's comment below, he uses in_branch which might be easier than contained_in.

I'm not sure whether these features exist in the stable version, but a new stable version will be released shortly.

I think an FR to make it simpler makes sense as well, but if you or me or any other reader feel up to trying the complicated way, they might gain some insight into what's useful and how to best design it.

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