feat(examples): add p/demo/avl/rotree

[moul]

Context: #3166 (comment)

[codecov]

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[moul]

I clicked on "SKIP" because the bot is unnecessarily suggesting an update to the base branch, which makes no sense for PRs only adding a new ./examples entry. I still believe the bot should either issue a warning about this or simply ignore it altogether.

cc @aeddi @thehowl

Edit: #3238 (comment)

[leohhhn]

LGTM, need this asap, will merge after CI.