feat(docs): generate gif for better doc integration #43

Job	Run time
build (1.21.x, amd64, linux, ./pkg/amino/cmd/aminoscan)	16s
build (1.21.x, amd64, linux, ./pkg/amino/cmd/goscan)	11s
build (1.21.x, amd64, linux, ./pkg/autofile/cmd)	30s
test (1.21.x, _test.flappy)	35s
build (1.21.x, amd64, linux, ./pkg/iavl/cmd/iaviewer)	12s
test (1.21.x, _test.pkg.amino)	1m 35s
build (1.22.x, amd64, linux, ./pkg/amino/cmd/aminoscan)	11s
test (1.21.x, _test.pkg.bft)	2m 24s
build (1.22.x, amd64, linux, ./pkg/amino/cmd/goscan)	11s
test (1.21.x, _test.pkg.others)	1m 35s
build (1.22.x, amd64, linux, ./pkg/autofile/cmd)	13s
test (1.22.x, _test.flappy)	34s
build (1.22.x, amd64, linux, ./pkg/iavl/cmd/iaviewer)	12s
test (1.22.x, _test.pkg.amino)	1m 31s
test (1.22.x, _test.pkg.bft)	2m 30s
test (1.22.x, _test.pkg.others)	1m 28s
upload-coverage	10s
	14m 18s

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