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/test_utils/execution_block_generator.rs

@@ -659,6 +659,8 @@ impl<E: EthSpec> ExecutionBlockGenerator<E> {
                     withdrawals: pa.withdrawals.clone().into(),
                     blob_gas_used: 0,
                     excess_blob_gas: 0,
+                    deposit_receipts: vec![].into(),
+                    withdrawal_requests: vec![].into(),
                 }),
                 _ => unreachable!(),
             },