feat: implement `txs generate` and `txs clear` command #4177

Job	Run time
build (1.21.x, amd64, linux, ./pkg/amino/cmd/aminoscan)	11s
test (1.21.x, _test.flappy)	29s
build (1.21.x, amd64, linux, ./pkg/amino/cmd/goscan)	7s
build (1.21.x, amd64, linux, ./pkg/autofile/cmd)	17s
test (1.21.x, _test.pkg.amino)	1m 25s
build (1.21.x, amd64, linux, ./pkg/iavl/cmd/iaviewer)	9s
test (1.21.x, _test.pkg.bft)	2m 34s
build (1.22.x, amd64, linux, ./pkg/amino/cmd/aminoscan)	19s
test (1.21.x, _test.pkg.others)	1m 33s
build (1.22.x, amd64, linux, ./pkg/amino/cmd/goscan)	7s
test (1.22.x, _test.flappy)	30s
build (1.22.x, amd64, linux, ./pkg/autofile/cmd)	10s
test (1.22.x, _test.pkg.amino)	1m 37s
build (1.22.x, amd64, linux, ./pkg/iavl/cmd/iaviewer)	10s
test (1.22.x, _test.pkg.bft)	2m 26s
test (1.22.x, _test.pkg.others)	1m 22s
upload-coverage	15s
	13m 41s

Provide feedback