Add shortcuts for Web3Serializer

[y9san9]

abstract class Web3Deserializer : DeserializationStrategy {
    override fun descriptor = /* STRING */
    override fun decode(decoder) {
        val string = decoder.decodeString()
        return decode(string.chunked(size = PART_SIZE * 2).map { it.hexStringToByteArray() })
    }
    abstract fun decode(chunks: List<ByteArray>)
}

And other help classes for SerializationStrategy and KSerializer (composition of this twos), so I won't write boilerplate with chunked and converting to hex

[y9san9]

This issue is not related to the library 🙂