Add plumbing for PeerDAS supernodes (#5050, #5409, #5570, #5966) (#6216)

* Add plumbing for peerdas supernodes (#5050, #5409, #5570, #5966)
- add cli option `--subscribe-to-all-data-columns`
- add custody subnet count to ENR, only if PeerDAS is scheduled
- subscribe to data column topics, only if PeerDAS is scheduled

Co-authored-by: Jacob Kaufmann <jacobkaufmann18@gmail.com>

* Merge branch 'unstable' into das-supernode

* Update CLI docs.

* Merge branch 'unstable' into das-supernode

* Fix fork epoch comparison with `FAR_FUTURE_EPOCH`.

* Merge branch 'unstable' into das-supernode

* Hide `--subscribe-all-data-column-subnets` flag and update help.

* Fix docs only

* Merge branch 'unstable' into das-supernode

beacon_node/beacon_chain/src/builder.rs

@@ -104,6 +104,7 @@ pub struct BeaconChainBuilder<T: BeaconChainTypes> {
     kzg: Option<Arc<Kzg>>,
     task_executor: Option<TaskExecutor>,
     validator_monitor_config: Option<ValidatorMonitorConfig>,
+    import_all_data_columns: bool,
 }
 
 impl<TSlotClock, TEth1Backend, E, THotStore, TColdStore>
@@ -145,6 +146,7 @@ where
             kzg: None,
             task_executor: None,
             validator_monitor_config: None,
+            import_all_data_columns: false,
         }
     }
 
@@ -615,6 +617,12 @@ where
         self
     }
 
+    /// Sets whether to require and import all data columns when importing block.
+    pub fn import_all_data_columns(mut self, import_all_data_columns: bool) -> Self {
+        self.import_all_data_columns = import_all_data_columns;
+        self
+    }
+
     /// Sets the `BeaconChain` event handler backend.
     ///
     /// For example, provide `ServerSentEventHandler` as a `handler`.
@@ -965,8 +973,15 @@ where
             validator_monitor: RwLock::new(validator_monitor),
             genesis_backfill_slot,
             data_availability_checker: Arc::new(
-                DataAvailabilityChecker::new(slot_clock, self.kzg.clone(), store, &log, self.spec)
-                    .map_err(|e| format!("Error initializing DataAvailabiltyChecker: {:?}", e))?,
+                DataAvailabilityChecker::new(
+                    slot_clock,
+                    self.kzg.clone(),
+                    store,
+                    self.import_all_data_columns,
+                    &log,
+                    self.spec,
+                )
+                .map_err(|e| format!("Error initializing DataAvailabilityChecker: {:?}", e))?,
             ),
             kzg: self.kzg.clone(),
         };