docs: add gnoclient reference & how-to guide #3333

Job	Run time
build (1.21.x, amd64, linux, ./pkg/amino/cmd/aminoscan)	14s
test (1.21.x, _test.flappy)	26s
build (1.21.x, amd64, linux, ./pkg/amino/cmd/goscan)	12s
build (1.21.x, amd64, linux, ./pkg/autofile/cmd)	11s
test (1.21.x, _test.pkg.amino)	1m 43s
build (1.21.x, amd64, linux, ./pkg/iavl/cmd/iaviewer)	16s
test (1.21.x, _test.pkg.bft)	2m 19s
build (1.22.x, amd64, linux, ./pkg/amino/cmd/aminoscan)	11s
test (1.21.x, _test.pkg.others)	1m 14s
build (1.22.x, amd64, linux, ./pkg/amino/cmd/goscan)	19s
test (1.22.x, _test.flappy)	23s
build (1.22.x, amd64, linux, ./pkg/autofile/cmd)	17s
test (1.22.x, _test.pkg.amino)	1m 28s
build (1.22.x, amd64, linux, ./pkg/iavl/cmd/iaviewer)	12s
test (1.22.x, _test.pkg.bft)	2m 30s
test (1.22.x, _test.pkg.others)	1m 18s
upload-coverage	10s
	13m 23s

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