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/lib.rs

@@ -2003,6 +2003,11 @@ impl<E: EthSpec> ExecutionLayer<E> {
                     withdrawals,
                     blob_gas_used: electra_block.blob_gas_used,
                     excess_blob_gas: electra_block.excess_blob_gas,
+                    // TODO(electra)
+                    // deposit_receipts: electra_block.deposit_receipts,
+                    // withdrawal_requests: electra_block.withdrawal_requests,
+                    deposit_receipts: <_>::default(),
+                    withdrawal_requests: <_>::default(),
                 })
             }
         };