feat(examples): add p/demo/avl/rotree #7465

Job	Run time
setup	2s
Run Main (github-bot) / Go Linter / lint	30s
Run Main (github-bot) / Go Build / generated	5s
Run Main (github-bot) / Go Test / test	24s
Run Main (gnodev) / Go Build / generated	8s
Run Main (gnodev) / Go Linter / lint	42s
Run Main (gnodev) / Go Test / test	1m 20s
Run Main (gnofaucet) / Go Build / generated	10s
Run Main (gnofaucet) / Go Linter / lint	33s
Run Main (gnofaucet) / Go Test / test	42s
Run Main (gnogenesis) / Go Build / generated	9s
Run Main (gnogenesis) / Go Linter / lint	38s
Run Main (gnogenesis) / Go Test / test	45s
Run Main (gnohealth) / Go Linter / lint	25s
Run Main (gnohealth) / Go Build / generated	5s
Run Main (gnohealth) / Go Test / test	29s
Run Main (gnokeykc) / Go Build / generated	10s
Run Main (gnokeykc) / Go Linter / lint	39s
Run Main (gnokeykc) / Go Test / test	37s
Run Main (gnomd) / Go Build / generated	10s
Run Main (gnomd) / Go Linter / lint	29s
Run Main (gnomd) / Go Test / test	26s
Run Main (gnomigrate) / Go Build / generated	4s
Run Main (gnomigrate) / Go Test / test	38s
Run Main (gnomigrate) / Go Linter / lint	32s
	10m 52s

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