Serialize Ciphertext G1 and G2 points in compressed form

Lines 53 to 57 in 434fd5d

    
           pub fn serialized_length(&self) -> usize { 
        
               self.commitment.serialized_size(Compress::No) 
        
                   + self.auth_tag.serialized_size(Compress::No) 
        
                   + self.ciphertext.len() 
        
           }

This function is either incorrect & unused (in which case, it should be fixed/removed), or it's hinting that we're serializing the U and W components in uncompressed form (which is slightly wasteful).

The method above is not used and will be removed by #149. Regarding the original question, G1 and G2 points in ciphertexts are serialized in compressed form as seen on ferveo-common/src/serialization.rs.

	pub fn serialized_length(&self) -> usize {
	self.commitment.serialized_size(Compress::No)
	+ self.auth_tag.serialized_size(Compress::No)
	+ self.ciphertext.len()
	}