Initial Commit of Retrospective OTB Verification (#3372)

## Issue Addressed

* #2983 

## Proposed Changes

Basically followed the [instructions laid out here](https://github.com/sigp/lighthouse/issues/2983#issuecomment-1062494947)


Co-authored-by: Paul Hauner <paul@paulhauner.com>
Co-authored-by: ethDreamer <37123614+ethDreamer@users.noreply.github.com>

beacon_node/store/src/lib.rs

@@ -208,6 +208,9 @@ pub enum DBColumn {
     BeaconRandaoMixes,
     #[strum(serialize = "dht")]
     DhtEnrs,
+    /// For Optimistically Imported Merge Transition Blocks
+    #[strum(serialize = "otb")]
+    OptimisticTransitionBlock,
 }
 
 /// A block from the database, which might have an execution payload or not.