feat(cast): add string-decode to decode string

[jsvisa]

Motivation

When I'm debugging some transactions that we reverted, what I got from the tx's trace as below:

{
  "from": "0x7567d83b7b8d80addcb281a71d54fc7b3364ffed",
  "gas": "0x0",
  "gasUsed": "0x0",
  "to": "0x5ff0bea4603b68c7e80b8a973a666b9840db248c",
  "input": "0x6a76120200000000000000000000000034053113b5ddc6fb368e4d028c1bbbcb85c14ef1...",
  "output": "0x08c379a0000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000000054753303235000000000000000000000000000000000000000000000000000000",
  "error": "execution reverted",
  "calls": [
    {
      "from": "0x5ff0bea4603b68c7e80b8a973a666b9840db248c",
      "gas": "0xbbf0",
      "gasUsed": "0x24cc",
      "to": "0x632cd990566bc2cc888f75c9bbe8b9185a91d24d",
      "input": "0x6a76120200000000000000000000000034053113b5ddc6fb368e4d028c1bbbcb85c14ef1...",
      "output": "0x08c379a0000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000000054753303235000000000000000000000000000000000000000000000000000000",
      "error": "execution reverted",
      "type": "DELEGATECALL"
    }
  ],
  "value": "0x0",
  "type": "CALL"
}

And this output is ABI-encode of Error(string), so I think we can add a simple command to decode the ABI-string into human readable msg, for this case:

$ ./target/release/cast 
 string-decode 0x88c379a0000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000000054753303235000000000000000000000000000000000000000000000000000000

"GS025"

Inspired from https://ethereum.stackexchange.com/a/77530

Solution

[mattsse]

sounds reasonable to me
wdyt @grandizzy

[grandizzy]

makes sense, thank you! @jsvisa could you please also add a test, here's a sample:

foundry/crates/cast/tests/cli/main.rs

Lines 1403 to 1405 in 9d74675

	casttest!(parse_units, |_prj, cmd| {
	cmd.args(["parse-units", "1.5", "6"]).assert_success().stdout_eq(str![[r#"
	1500000

[zerosnacks]

Applied minor documentation fixes, proposed goal is reasonable + implementation LGTM