feat: add file-based transaction indexing #1069

Job	Run time
build (1.20.x, amd64, linux, ./pkg/amino/cmd/aminoscan)	15s
build (1.20.x, amd64, linux, ./pkg/amino/cmd/goscan)	12s
build (1.20.x, amd64, linux, ./pkg/autofile/cmd)	11s
build (1.20.x, amd64, linux, ./pkg/iavl/cmd/iaviewer)	15s
test (1.20.x, _test.flappy)	23s
test (1.20.x, _test.pkg.amino)	3m 19s
build (1.21.x, amd64, linux, ./pkg/amino/cmd/aminoscan)	24s
test (1.20.x, _test.pkg.bft)	4m 10s
build (1.21.x, amd64, linux, ./pkg/amino/cmd/goscan)	22s
test (1.20.x, _test.pkg.others)	5m 19s
build (1.21.x, amd64, linux, ./pkg/autofile/cmd)	25s
test (1.21.x, _test.flappy)	57s
test (1.21.x, _test.pkg.amino)	4m 38s
build (1.21.x, amd64, linux, ./pkg/iavl/cmd/iaviewer)	27s
test (1.21.x, _test.pkg.bft)	4m 54s
test (1.21.x, _test.pkg.others)	6m 36s
upload-coverage	9s
	32m 56s

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