Avoid requiring unnecessary hex-encoding and using decodeHex

[turbolent]

Closes #17

⚠️ NOTE: This is a breaking change, users of this repo will need to remove hex-encoding of the code and instead pass the code as-is.

[bluesign]

maybe we can make this non-breaking by checking:
something like:

prepare(signer: AuthAccount) {
    signer.contracts.add(name: name, code: code.utf8.contains(32) ? code.utf8 : code.decodeHex())
}

[nozim]

probably some alternative method that uses utf8 string instead of hex could help avoid breaking changes?

[nozim]

maybe we can make this non-breaking by checking: something like:

prepare(signer: AuthAccount) {
    signer.contracts.add(name: name, code: code.utf8.contains(32) ? code.utf8 : code.decodeHex())
}

this seems a bit confusing to me but would be happy to see other inputs :)

[bluesign]

Basically it is checking if there is space character in code, if there is space, it means we sent a String without hex encoding (so we use .utf8 ), if there is no space, we sent hex encoded (so we use decodeHex). ( as we cannot create a contract code without spaces )