feat(repl): support multi-line inputs and declarations (#978) #16

Job	Run time
test (1.19.x, _test.flappy)	47s
test (1.19.x, _test.pkg.amino)	3m 56s
test (1.19.x, _test.pkg.bft)	15m 12s
test (1.19.x, _test.pkg.others)	5m 50s
test (1.19.x, _test.cmds)	44s
test (1.20.x, _test.flappy)	41s
test (1.20.x, _test.pkg.amino)	3m 51s
test (1.20.x, _test.pkg.bft)	4m 31s
test (1.20.x, _test.pkg.others)	6m 41s
test (1.20.x, _test.cmds)	55s
build (1.19.x, amd64, linux, ./cmd/tm2txsync)	33s
build (1.19.x, amd64, linux, ./pkg/amino/cmd/aminoscan)	19s
build (1.19.x, amd64, linux, ./pkg/amino/cmd/goscan)	6s
build (1.19.x, amd64, linux, ./pkg/autofile/cmd)	13s
build (1.19.x, amd64, linux, ./pkg/iavl/cmd/iaviewer)	18s
build (1.20.x, amd64, linux, ./cmd/tm2txsync)	42s
build (1.20.x, amd64, linux, ./pkg/amino/cmd/aminoscan)	19s
build (1.20.x, amd64, linux, ./pkg/amino/cmd/goscan)	16s
build (1.20.x, amd64, linux, ./pkg/autofile/cmd)	14s
build (1.20.x, amd64, linux, ./pkg/iavl/cmd/iaviewer)	19s
	46m 27s

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