Store changes to persist data columns (#6073)

* Store changes to persist data columns.

Co-authored-by: dapplion <35266934+dapplion@users.noreply.github.com>

* Update to use `eip7594_fork_epoch` for data column slot in Store.

* Fix formatting.

* Merge branch 'unstable' into data-columns-store

# Conflicts:
#	beacon_node/store/src/lib.rs
#	consensus/types/src/chain_spec.rs

* Minor refactor.

* Merge branch 'unstable' into data-columns-store

# Conflicts:
#	beacon_node/store/src/metrics.rs

* Init data colum info at PeerDAS epoch instead of Deneb fork epoch. Address review comments.

* Remove Deneb-related comments

beacon_node/store/src/metadata.rs

@@ -16,6 +16,7 @@ pub const PRUNING_CHECKPOINT_KEY: Hash256 = Hash256::repeat_byte(3);
 pub const COMPACTION_TIMESTAMP_KEY: Hash256 = Hash256::repeat_byte(4);
 pub const ANCHOR_INFO_KEY: Hash256 = Hash256::repeat_byte(5);
 pub const BLOB_INFO_KEY: Hash256 = Hash256::repeat_byte(6);
+pub const DATA_COLUMN_INFO_KEY: Hash256 = Hash256::repeat_byte(7);
 
 /// State upper limit value used to indicate that a node is not storing historic states.
 pub const STATE_UPPER_LIMIT_NO_RETAIN: Slot = Slot::new(u64::MAX);
@@ -152,3 +153,30 @@ impl StoreItem for BlobInfo {
         Ok(Self::from_ssz_bytes(bytes)?)
     }
 }
+
+/// Database parameters relevant to data column sync.
+#[derive(Debug, PartialEq, Eq, Clone, Encode, Decode, Serialize, Deserialize, Default)]
+pub struct DataColumnInfo {
+    /// The slot after which data columns are or *will be* available (>=).
+    ///
+    /// If this slot is in the future, then it is the first slot of the EIP-7594 fork, from which
+    /// data columns will be available.
+    ///
+    /// If the `oldest_data_column_slot` is `None` then this means that the EIP-7594 fork epoch is
+    /// not yet known.
+    pub oldest_data_column_slot: Option<Slot>,
+}
+
+impl StoreItem for DataColumnInfo {
+    fn db_column() -> DBColumn {
+        DBColumn::BeaconMeta
+    }
+
+    fn as_store_bytes(&self) -> Vec<u8> {
+        self.as_ssz_bytes()
+    }
+
+    fn from_store_bytes(bytes: &[u8]) -> Result<Self, Error> {
+        Ok(Self::from_ssz_bytes(bytes)?)
+    }
+}