feat(examples): add simple userbook realm #4085

Job	Run time
test (1.21.x, _test.flappy)	33s
build (1.21.x, amd64, linux, ./pkg/amino/cmd/aminoscan)	11s
build (1.21.x, amd64, linux, ./pkg/amino/cmd/goscan)	5s
build (1.21.x, amd64, linux, ./pkg/autofile/cmd)	14s
test (1.21.x, _test.pkg.amino)	1m 34s
build (1.21.x, amd64, linux, ./pkg/iavl/cmd/iaviewer)	10s
test (1.21.x, _test.pkg.bft)	2m 18s
build (1.22.x, amd64, linux, ./pkg/amino/cmd/aminoscan)	12s
test (1.21.x, _test.pkg.others)	1m 22s
build (1.22.x, amd64, linux, ./pkg/amino/cmd/goscan)	7s
test (1.22.x, _test.flappy)	31s
build (1.22.x, amd64, linux, ./pkg/autofile/cmd)	6s
test (1.22.x, _test.pkg.amino)	1m 23s
build (1.22.x, amd64, linux, ./pkg/iavl/cmd/iaviewer)	9s
test (1.22.x, _test.pkg.bft)	2m 29s
test (1.22.x, _test.pkg.others)	1m 27s
upload-coverage	15s
	13m 6s

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