add HTTP API to retrieve validator IL duties

common/eth2/src/types.rs

@@ -740,6 +740,14 @@ pub struct ProposerData {
     pub slot: Slot,
 }
 
+#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
+pub struct InclusionListDutyData {
+    pub pubkey: PublicKeyBytes,
+    #[serde(with = "serde_utils::quoted_u64")]
+    pub validator_index: u64,
+    pub slot: Slot,
+}
+
 #[derive(Clone, Deserialize)]
 pub struct ValidatorBlocksQuery {
     pub randao_reveal: SignatureBytes,