hevm: RLP decoding

[MrChico]

Try out with:

hevm rlpdecode --rlphexstring 0xf8cc830104c8843b9aca008303d090947ef66b77759e12caf3ddb3e4aff524e577c59d8d80b864e9c6c176000000000000000000000000000000000000000000000000000000000000002a0000000000000000000000000000000000000000000000000000000000ae2ec63ac35c0361930ebfe79f003d5126ffae73455ee598f0c0650992ffeb0e55d48f1ba0724cf21e40eacc69950b27fdc3fcbf85c90f0be7c3605f49f244c7a09090bc22a077cb625ea2ce71503fef43288b7ad5702d4eb6469cdf17b117940b91d5aa430a

[livnev]

@MrChico The ergonomics could use some improvements, e.g. I liked your proposal of hevm rlp --decode. Is --rlphexstring really needed? What other form of RLP-encoded input could it possibly accept?

[MrChico]

Yeah, no the hexstring stuff is Def not needed I just didn't know how to make it without a flag because all of other commands were using flags lol

[MrChico]

@livnev I haven't implemented --encode right now because I'm not quite sure how to write the Read instance for the RLP type that would make that not horrible to use. If you know how to do this we can get both flags.