add consolidation processing

consensus/state_processing/src/per_block_processing/errors.rs

@@ -89,6 +89,46 @@ pub enum BlockProcessingError {
         found: Hash256,
     },
     WithdrawalCredentialsInvalid,
+    TooManyPendingConsolidations {
+        consolidations: usize,
+        limit: usize,
+    },
+    ConsolidationChurnLimitTooLow {
+        churn_limit: u64,
+        minimum: u64,
+    },
+    MatchingSourceTargetConsolidation {
+        index: u64,
+    },
+    InactiveConsolidationSource {
+        index: u64,
+        current_epoch: Epoch,
+    },
+    InactiveConsolidationTarget {
+        index: u64,
+        current_epoch: Epoch,
+    },
+    SourceValidatorExiting {
+        index: u64,
+    },
+    TargetValidatorExiting {
+        index: u64,
+    },
+    FutureConsolidationEpoch {
+        current_epoch: Epoch,
+        consolidation_epoch: Epoch,
+    },
+    NoSourceExecutionWithdrawalCredential {
+        index: u64,
+    },
+    NoTargetExecutionWithdrawalCredential {
+        index: u64,
+    },
+    MismatchedWithdrawalCredentials {
+        source_address: Address,
+        target_address: Address,
+    },
+    InavlidConsolidationSignature,
 }
 
 impl From<BeaconStateError> for BlockProcessingError {