feat(cast): decode external lib sigs from cached selectors

[grandizzy]

Motivation

Closes #5950

• external libraries ABIs does not add functions in abi but they are listed as methodIdentifiers, e.g. abi for

library ExternalLib {
    function update(uint256 a, uint256 counter) public {}
}

contains fields as

"abi":[]
"methodIdentifiers":{"update(uint256,uint256)":"2fb565e8"}"

• steps for cast run does not decode calldata for library (delegate-)call. #5950 to show proper decoded traces:

forge clone 0xBb02bCCE1bdcc0b07E7870346D8b2ad9397D0fAC --etherscan-api-key $ETHERSCAN_KEY
forge selectors cache
cast run --rpc-url $RPC_URL 0x07a6ad95d76f4c1318d38564439347b39a47b126a7cbd3fe0b58a980392d4a35

• as a follow up (ideally) we would use methods identifiers for forge test traces too (that is without need of forge selectors cache being issued)

Solution

• forge selectors cache to use contract's methodIdentifiers as well
• fix panic if event decoded with different sigs (e.g. Transfer(from, to) decoded with Transfer(address indexed from, address indexed to, uint256 indexed tokenId))

[mattsse]

lgtm

[mattsse]

ah nice find