chore: remove rlp encoding for Request (alloy-rs#751)

the EIP was a bit ambigious here, apparently we are not
supposed to also RLP encode the result of the
EIP-7685 encoding. instead, to compute the request root,
we should just stuff the EIP-7685 encoded request
into a list and RLP encode that list

this simply removes the unneeded RLP encoding

crates/consensus/src/request.rs

@@ -3,7 +3,7 @@ use alloy_eips::{
     eip7002::WithdrawalRequest,
     eip7685::{Decodable7685, Eip7685Error, Encodable7685},
 };
-use alloy_rlp::{Decodable, Encodable, Header};
+use alloy_rlp::{Decodable, Encodable};
 
 /// Ethereum execution layer requests.
 ///
@@ -92,16 +92,3 @@ impl Decodable7685 for Request {
         })
     }
 }
-
-impl Encodable for Request {
-    fn encode(&self, out: &mut dyn alloy_rlp::BufMut) {
-        self.encoded_7685().encode(out)
-    }
-}
-
-impl Decodable for Request {
-    fn decode(buf: &mut &[u8]) -> alloy_rlp::Result<Self> {
-        let mut data = Header::decode_bytes(buf, false)?;
-        Ok(Self::decode_7685(&mut data)?)
-    }
-}