chore: rename r/system -> r/sys #3814

Job	Run time
build (1.21.x, amd64, linux, ./pkg/amino/cmd/aminoscan)	14s
build (1.21.x, amd64, linux, ./pkg/amino/cmd/goscan)	22s
test (1.21.x, _test.flappy)	45s
build (1.21.x, amd64, linux, ./pkg/autofile/cmd)	25s
build (1.21.x, amd64, linux, ./pkg/iavl/cmd/iaviewer)	14s
test (1.21.x, _test.pkg.amino)	1m 39s
build (1.22.x, amd64, linux, ./pkg/amino/cmd/aminoscan)	12s
test (1.21.x, _test.pkg.bft)	2m 41s
build (1.22.x, amd64, linux, ./pkg/amino/cmd/goscan)	15s
test (1.21.x, _test.pkg.others)	1m 27s
build (1.22.x, amd64, linux, ./pkg/autofile/cmd)	13s
test (1.22.x, _test.flappy)	35s
build (1.22.x, amd64, linux, ./pkg/iavl/cmd/iaviewer)	17s
test (1.22.x, _test.pkg.amino)	1m 37s
test (1.22.x, _test.pkg.bft)	2m 49s
test (1.22.x, _test.pkg.others)	1m 26s
upload-coverage	10s
	15m 21s

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