Gloas cold DB (#8991)

Closes:

- https://github.com/sigp/lighthouse/issues/8958


  - Update the `HotColdStore` to handle storage of cold states.
- Update `BeaconSnapshot` to hold the execution envelope. This is required to make `chain_dump`-related checks sane, and will be generally useful (see: https://github.com/sigp/lighthouse/issues/8956).
- Bug fix in the `BlockReplayer` for the case where the starting state is already `Full` (we should not try to apply another payload). This happens on the cold DB path because we try to replay from the closest cached state (which is often full).
- Update `test_gloas_hot_state_hierarchy` to cover the cold DB migration.


Co-Authored-By: Michael Sproul <michael@sigmaprime.io>

Co-Authored-By: Michael Sproul <michaelsproul@users.noreply.github.com>

beacon_node/beacon_chain/tests/block_verification.rs

@@ -77,8 +77,10 @@ async fn get_chain_segment() -> (Vec<BeaconSnapshot<E>>, Vec<Option<DataSidecars
             .unwrap();
         let block_epoch = full_block.epoch();
 
+        // TODO(gloas): probably need to update this test
         segment.push(BeaconSnapshot {
             beacon_block_root: snapshot.beacon_block_root,
+            execution_envelope: None,
             beacon_block: Arc::new(full_block),
             beacon_state: snapshot.beacon_state,
         });