feat(sdk/vm): support return values from main in msgrun #2295

Job	Run time
build (1.20.x, amd64, linux, ./pkg/amino/cmd/aminoscan)	8s
test (1.20.x, _test.flappy)	19s
build (1.20.x, amd64, linux, ./pkg/amino/cmd/goscan)	5s
test (1.20.x, _test.pkg.amino)	1m 30s
build (1.20.x, amd64, linux, ./pkg/autofile/cmd)	12s
test (1.20.x, _test.pkg.bft)	21m 13s
build (1.20.x, amd64, linux, ./pkg/iavl/cmd/iaviewer)	14s
test (1.20.x, _test.pkg.others)	2m 39s
build (1.21.x, amd64, linux, ./pkg/amino/cmd/aminoscan)	16s
test (1.21.x, _test.flappy)	39s
build (1.21.x, amd64, linux, ./pkg/amino/cmd/goscan)	16s
test (1.21.x, _test.pkg.amino)	1m 40s
build (1.21.x, amd64, linux, ./pkg/autofile/cmd)	18s
test (1.21.x, _test.pkg.bft)	2m 40s
build (1.21.x, amd64, linux, ./pkg/iavl/cmd/iaviewer)	19s
test (1.21.x, _test.pkg.others)	2m 55s
upload-coverage	0s
	35m 23s

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