feat: r/system/names public functions and checks with AddPackage #423

Job	Run time
build (1.19.x, amd64, linux, ./cmd/tm2txsync)	22s
build (1.19.x, amd64, linux, ./pkg/amino/cmd/aminoscan)	10s
build (1.19.x, amd64, linux, ./pkg/amino/cmd/goscan)	9s
build (1.19.x, amd64, linux, ./pkg/autofile/cmd)	5s
build (1.19.x, amd64, linux, ./pkg/iavl/cmd/iaviewer)	17s
build (1.20.x, amd64, linux, ./cmd/tm2txsync)	36s
build (1.20.x, amd64, linux, ./pkg/amino/cmd/aminoscan)	12s
build (1.20.x, amd64, linux, ./pkg/amino/cmd/goscan)	13s
build (1.20.x, amd64, linux, ./pkg/autofile/cmd)	14s
build (1.20.x, amd64, linux, ./pkg/iavl/cmd/iaviewer)	22s
test (1.19.x, _test.flappy)	31s
test (1.19.x, _test.pkg.amino)	3m 20s
test (1.19.x, _test.pkg.bft)	15m 13s
test (1.19.x, _test.pkg.others)	6m 31s
test (1.19.x, _test.cmds)	44s
test (1.20.x, _test.flappy)	45s
test (1.20.x, _test.pkg.amino)	4m 37s
test (1.20.x, _test.pkg.bft)	5m 0s
test (1.20.x, _test.pkg.others)	5m 25s
test (1.20.x, _test.cmds)	1m 5s
	45m 51s

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