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.rs

@@ -632,6 +632,9 @@ impl<E: EthSpec> ExecutionPayloadBodyV1<E> {
                         withdrawals,
                         blob_gas_used: header.blob_gas_used,
                         excess_blob_gas: header.excess_blob_gas,
+                        // TODO(electra)
+                        deposit_receipts: <_>::default(),
+                        withdrawal_requests: <_>::default(),
                     }))
                 } else {
                     Err(format!(