feat: abi encode/decode

[bsh98]

Compile time abi encoding and decoding could be useful.

Perhaps something like

let (address, value) = abi_decode!(
     "transfer(address,uint256)",
     "a9059cbb000000..."
);

and

let calldata = abi_encode!(
     "transfer(address,uint256)",
     ("abc...", 42),
);