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

[moul]

Context: #3166 (comment)

[codecov]

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[Gno2D2]

🛠 PR Checks Summary

🔴 The pull request head branch must be up-to-date with its base (more info)

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Automated Checks

Maintainers must be able to edit this pull request (more info)

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The pull request head branch must be up-to-date with its base (more info)

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└── 🔴 Head branch (moul:dev/moul/rotree) is up to date with base (master): behind by 2 / ahead by 6

Manual Checks

**SKIP**: Do not block the CI for this PR

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