* Move reconstruction logic out of `overflow_lru_cache` to simplify the code and avoids having to pass `DataColumnsToPublish` around and blocking other processing.
* Publish reconstructed cells before recomputing head. Remove duplicate functions.
* Merge branch 'unstable' into non-blocking-reconstruction
* Merge branch 'unstable' into non-blocking-reconstruction
# Conflicts:
# beacon_node/beacon_chain/src/beacon_chain.rs
# beacon_node/beacon_chain/src/data_availability_checker.rs
# beacon_node/beacon_chain/src/data_availability_checker/overflow_lru_cache.rs
# beacon_node/network/src/network_beacon_processor/sync_methods.rs
* Spawn a blocking task for reconstruction.
* Merge branch 'unstable' into non-blocking-reconstruction
# Conflicts:
# beacon_node/network/src/network_beacon_processor/mod.rs
* Fix fmt
* Merge branch 'unstable' into non-blocking-reconstruction
# Conflicts:
# beacon_node/beacon_chain/src/data_availability_checker/overflow_lru_cache.rs
* Fix race condition by making check and mutation atomic as suggested by Lion. Also added error handling to reconstruction failure.
* Add reconstruction reason metric and more debug logging to da checker.
* Add comment and logging.
* Rename `NotRequired` to `NotStarted`.
* Remove extra character added.