feat(huff_codegen): Constructor Argument Encoding

[refcell]

Overview

Currently, constructor arg encoding isn't complete which is necessary for the huff_cli to function properly.

We need to implement the encode_constructor_args() function of the huff_codegen module to translate a vec of String inputs into ethers Token.

TODO: implement this function.

[exp-table]

In the constructor macro, you are only able to retrieve the encoded constructor arguments if they are not dynamically-sized arrays, including bytes and string if they are over 31 bytes long.

Why? Because you don't know their sizes in advance, thus you cannot deduce where the constructor encoded args start, whereas with value types, short bytes/string and fixed-sized arrays, you can know the total size and substract it from the codesize to obtain the starting position of the constructor args.

See the issue on huffc.