Strict fee recipient (#3363)

## Issue Addressed

Resolves #3267
Resolves #3156 

## Proposed Changes

- Move the log for fee recipient checks from proposer cache insertion into block proposal so we are directly checking what we get from the EE
- Only log when there is a discrepancy with the local EE, not when using the builder API. In the `builder-api` branch there is an `info` log when there is a discrepancy, I think it is more likely there will be a difference in fee recipient with the builder api because proposer payments might be made via a transaction in the block. Not really sure what patterns will become commong.
- Upgrade the log from a `warn` to an `error` - not actually sure which we want, but I think this is worth an error because the local EE with default transaction ordering I think should pretty much always use the provided fee recipient
- add a `strict-fee-recipient` flag to the VC so we only sign blocks with matching fee recipients. Falls back from the builder API to the local API if there is a discrepancy .




Co-authored-by: realbigsean <sean@sigmaprime.io>

consensus/types/src/payload.rs

@@ -44,6 +44,7 @@ pub trait ExecPayload<T: EthSpec>:
     fn block_number(&self) -> u64;
     fn timestamp(&self) -> u64;
     fn block_hash(&self) -> ExecutionBlockHash;
+    fn fee_recipient(&self) -> Address;
 }
 
 impl<T: EthSpec> ExecPayload<T> for FullPayload<T> {
@@ -74,6 +75,10 @@ impl<T: EthSpec> ExecPayload<T> for FullPayload<T> {
     fn block_hash(&self) -> ExecutionBlockHash {
         self.execution_payload.block_hash
     }
+
+    fn fee_recipient(&self) -> Address {
+        self.execution_payload.fee_recipient
+    }
 }
 
 impl<T: EthSpec> ExecPayload<T> for BlindedPayload<T> {
@@ -104,6 +109,10 @@ impl<T: EthSpec> ExecPayload<T> for BlindedPayload<T> {
     fn block_hash(&self) -> ExecutionBlockHash {
         self.execution_payload_header.block_hash
     }
+
+    fn fee_recipient(&self) -> Address {
+        self.execution_payload_header.fee_recipient
+    }
 }
 
 #[derive(Debug, Clone, TestRandom, Serialize, Deserialize, Derivative)]