NotRawByteEncodable
This is the opposite of a RawByteEncodable signature
This inverse "non-trait" is required to group CryptoSignature subtypes which cannot be encoded into raw byte arrays, since not all properties required to do so are known. For example, EC signatures parsed from an X509Certificate do not specify a curve. For signatures obtained this way, it is impossible to know how the components should be padded before encoding it into raw bytes.
The reason this interface exists, is that it allows for grouping all such signatures in the same manner as the RawByteEncodable ones, to allow for exhaustive when clauses