Electra other containers (#5652)

* add new fields to execution payload and header

* beacon state changes

* partial beacon state

* safe arith in upgrade to electra

* initialize balances cache in interop genesis state

* Revert "initialize balances cache in interop genesis state"

This reverts commit c60b522865.

* always initialize balances cache if necessary in electra upgrade

* build cache earlier

* fix block test

* per fork NUM_FIELDS_POW2

* Merge branch 'unstable' of https://github.com/sigp/lighthouse into electra-other-containers

* fix lints

* get fields based on post state, as is spec'd

* fix type and move cache build

beacon_node/execution_layer/src/engine_api/json_structures.rs

@@ -319,6 +319,9 @@ impl<E: EthSpec> From<JsonExecutionPayloadV4<E>> for ExecutionPayloadElectra<E>
                 .into(),
             blob_gas_used: payload.blob_gas_used,
             excess_blob_gas: payload.excess_blob_gas,
+            // TODO(electra)
+            deposit_receipts: Default::default(),
+            withdrawal_requests: Default::default(),
         }
     }
 }