feat: add gno.land/pkg/gnoclient (Gno.land Go client) #2156

Job	Run time
build (1.20.x, amd64, linux, ./pkg/amino/cmd/aminoscan)	12s
test (1.20.x, _test.flappy)	18s
build (1.20.x, amd64, linux, ./pkg/amino/cmd/goscan)	9s
test (1.20.x, _test.pkg.amino)	1m 27s
build (1.20.x, amd64, linux, ./pkg/autofile/cmd)	11s
test (1.20.x, _test.pkg.bft)	2m 20s
build (1.20.x, amd64, linux, ./pkg/iavl/cmd/iaviewer)	8s
test (1.20.x, _test.pkg.others)	2m 21s
build (1.21.x, amd64, linux, ./pkg/amino/cmd/aminoscan)	15s
test (1.21.x, _test.flappy)	21s
build (1.21.x, amd64, linux, ./pkg/amino/cmd/goscan)	12s
test (1.21.x, _test.pkg.amino)	1m 28s
build (1.21.x, amd64, linux, ./pkg/autofile/cmd)	15s
test (1.21.x, _test.pkg.bft)	2m 24s
build (1.21.x, amd64, linux, ./pkg/iavl/cmd/iaviewer)	13s
test (1.21.x, _test.pkg.others)	2m 21s
upload-coverage	4s
	14m 39s

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