add rlp decode subcommand #1201

Job	Run time
Gradle Wrapper Validation	5s
Repository Linting	44s
spotless	1m 42s
compile	5m 31s
unitTests (test -x besu:test -x consensus:test -x crypto:test -x ethereum:eth:test -x ethereum:ap...	11m 46s
unitTests (besu:test consensus:test crypto:test)	8m 44s
unitTests (ethereum:api:testBonsai)	14m 56s
unitTests (ethereum:api:testForest)	13m 33s
unitTests (ethereum:api:testRemainder)	4m 45s
unitTests (ethereum:eth:test)	22m 11s
unitTests (ethereum:core:test)	5m 51s
unittests-passed	1s
	1h 29m 49s

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