feat: add support for dynamic user addresses in txtar tests #2256

Job	Run time
build (1.20.x, amd64, linux, ./pkg/amino/cmd/aminoscan)	9s
test (1.20.x, _test.flappy)	31s
build (1.20.x, amd64, linux, ./pkg/amino/cmd/goscan)	14s
test (1.20.x, _test.pkg.amino)	1m 31s
build (1.20.x, amd64, linux, ./pkg/autofile/cmd)	11s
test (1.20.x, _test.pkg.bft)	2m 33s
build (1.20.x, amd64, linux, ./pkg/iavl/cmd/iaviewer)	18s
test (1.20.x, _test.pkg.others)	2m 31s
test (1.21.x, _test.flappy)	25s
test (1.21.x, _test.pkg.amino)	1m 34s
test (1.21.x, _test.pkg.bft)	21m 14s
test (1.21.x, _test.pkg.others)	2m 44s
build (1.21.x, amd64, linux, ./pkg/amino/cmd/aminoscan)	13s
build (1.21.x, amd64, linux, ./pkg/amino/cmd/goscan)	15s
build (1.21.x, amd64, linux, ./pkg/autofile/cmd)	13s
build (1.21.x, amd64, linux, ./pkg/iavl/cmd/iaviewer)	17s
upload-coverage	0s
	34m 53s

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