feat: add missing helper fns (#1880)

crates/consensus/src/block/header.rs

@@ -1,4 +1,7 @@
-use crate::constants::{EMPTY_OMMER_ROOT_HASH, EMPTY_ROOT_HASH};
+use crate::{
+    constants::{EMPTY_OMMER_ROOT_HASH, EMPTY_ROOT_HASH},
+    Block, BlockBody,
+};
 use alloc::vec::Vec;
 use alloy_eips::{
     eip1559::{calc_next_block_base_fee, BaseFeeParams},
@@ -168,6 +171,11 @@ impl Sealable for Header {
 }
 
 impl Header {
+    /// Create a [`Block`] from the body and its header.
+    pub const fn into_block<T>(self, body: BlockBody<T>) -> Block<T> {
+        body.into_block(self)
+    }
+
     /// Heavy function that will calculate hash of data and will *not* save the change to metadata.
     ///
     /// Use [`Header::seal_slow`] and unlock if you need the hash to be persistent.

crates/consensus/src/block/mod.rs

@@ -30,6 +30,11 @@ pub struct Block<T, H = Header> {
 }
 
 impl<T, H> Block<T, H> {
+    /// Creates a new block with the given header and body.
+    pub const fn new(header: H, body: BlockBody<T>) -> Self {
+        Self { header, body }
+    }
+
     /// Creates a new empty uncle block.
     pub fn uncle(header: H) -> Self {
         Self { header, body: Default::default() }