Implement Overflow LRU Cache for Pending Blobs (#4203)

* All Necessary Objects Implement Encode/Decode

* Major Components for LRUOverflowCache Implemented

* Finish Database Code

* Add Maintenance Methods

* Added Maintenance Service

* Persist Blobs on Shutdown / Reload on Startup

* Address Clippy Complaints

* Add (emum_behaviour = "tag") to ssz_derive

* Convert Encode/Decode Implementations to "tag"

* Started Adding Tests

* Added a ton of tests

* 1 character fix

* Feature Guard Minimal Spec Tests

* Update beacon_node/beacon_chain/src/data_availability_checker.rs

Co-authored-by: realbigsean <seananderson33@GMAIL.com>

* Address Sean's Comments

* Add iter_raw_keys method

* Remove TODOs

---------

Co-authored-by: realbigsean <seananderson33@GMAIL.com>

beacon_node/beacon_chain/src/builder.rs

@@ -794,7 +794,7 @@ where
         let beacon_chain = BeaconChain {
             spec: self.spec.clone(),
             config: self.chain_config,
-            store,
+            store: store.clone(),
             task_executor: self
                 .task_executor
                 .ok_or("Cannot build without task executor")?,
@@ -864,8 +864,10 @@ where
             data_availability_checker: DataAvailabilityChecker::new(
                 slot_clock,
                 kzg.clone(),
+                store,
                 self.spec,
-            ),
+            )
+            .map_err(|e| format!("Error initializing DataAvailabiltyChecker: {:?}", e))?,
             proposal_blob_cache: BlobCache::default(),
             kzg,
         };