Add Changes to BlobSidecars Endpoint (#4455)

* changed name

* Fix sidecars

* Added query type and parrameter

* added query struct and function

* added method

* improved filtering method

* added blob_sidecar_list_indexed to block_id

* minor blobqueryindex fix

* function and formatting fix

* minor function and naming fix

* minor changes

beacon_node/http_api/src/block_id.rs

@@ -1,5 +1,6 @@
 use crate::{state_id::checkpoint_slot_and_execution_optimistic, ExecutionOptimistic};
 use beacon_chain::{BeaconChain, BeaconChainError, BeaconChainTypes, WhenSlotSkipped};
+use eth2::types::BlobIndicesQuery;
 use eth2::types::BlockId as CoreBlockId;
 use std::fmt;
 use std::str::FromStr;
@@ -266,6 +267,26 @@ impl BlockId {
             Err(e) => Err(warp_utils::reject::beacon_chain_error(e)),
         }
     }
+
+    pub async fn blob_sidecar_list_filtered<T: BeaconChainTypes>(
+        &self,
+        indices: BlobIndicesQuery,
+        chain: &BeaconChain<T>,
+    ) -> Result<BlobSidecarList<T::EthSpec>, warp::Rejection> {
+        let blob_sidecar_list = self.blob_sidecar_list(&chain).await?;
+        let blob_sidecar_list_filtered = match indices.indices {
+            Some(vec) => {
+                let list = blob_sidecar_list
+                    .into_iter()
+                    .filter(|blob_sidecar| vec.contains(&blob_sidecar.index))
+                    .collect();
+                BlobSidecarList::new(list)
+                    .map_err(|e| warp_utils::reject::custom_server_error(format!("{:?}", e)))?
+            }
+            None => blob_sidecar_list,
+        };
+        Ok(blob_sidecar_list_filtered)
+    }
 }
 
 impl FromStr for BlockId {