feat: Introduce Block::into_ethereum_block to Block trait (#15940)

Co-authored-by: Matthias Seitz <matthias.seitz@outlook.de>
Co-authored-by: graphite-app[bot] <96075541+graphite-app[bot]@users.noreply.github.com>

crates/primitives-traits/src/block/mod.rs

@@ -177,6 +177,27 @@ pub trait Block:
         };
         Ok(RecoveredBlock::new_unhashed(self, signers))
     }
+
+    /// A Convenience function to convert this type into the regular ethereum block that
+    /// consists of:
+    ///
+    /// - Header
+    ///
+    /// And the ethereum block body [`alloy_consensus::BlockBody`], see also
+    /// [`BlockBody::into_ethereum_body`].
+    /// - Transactions
+    /// - Withdrawals
+    /// - Ommers
+    ///
+    /// Note: This conversion can be incomplete. It is not expected that this `Block` is the same as
+    /// [`alloy_consensus::Block`] only that it can be converted into it which is useful for
+    /// the `eth_` RPC namespace (e.g. RPC block).
+    fn into_ethereum_block(
+        self,
+    ) -> alloy_consensus::Block<<Self::Body as BlockBody>::Transaction, Self::Header> {
+        let (header, body) = self.split();
+        alloy_consensus::Block::new(header, body.into_ethereum_body())
+    }
 }
 
 impl<T, H> Block for alloy_consensus::Block<T, H>
@@ -206,6 +227,10 @@ where
     fn rlp_length(header: &Self::Header, body: &Self::Body) -> usize {
         Self::rlp_length_for(header, body)
     }
+
+    fn into_ethereum_block(self) -> Self {
+        self
+    }
 }
 
 /// An extension trait for [`Block`]s that allows for mutable access to the block's internals.