feat(examples): add hello_world, update `r/demo/event` #10563

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Job	Run time
gno2go (1.22.x)	30s
test (1.22.x)	3m 2s
fmt (1.22.x)	27s
lint (1.22.x)	3m 2s
mod-tidy (1.22.x)	2m 7s
	9m 8s