Modify lighthouse_network gossip types to free the blobs (#4064)

* Modify blob topics

* add signedblol type

pubsun messages are signed

* improve subnet topic index

* improve display code

* fix parse code

---------

Co-authored-by: Pawan Dhananjay <pawandhananjay@gmail.com>

consensus/types/src/lib.rs

@@ -101,6 +101,7 @@ pub mod sqlite;
 
 pub mod blob_sidecar;
 pub mod blobs_sidecar;
+pub mod signed_blob;
 pub mod signed_block_and_blobs;
 pub mod transaction;
 
@@ -181,6 +182,7 @@ pub use crate::signed_beacon_block::{
     SignedBlindedBeaconBlock,
 };
 pub use crate::signed_beacon_block_header::SignedBeaconBlockHeader;
+pub use crate::signed_blob::*;
 pub use crate::signed_block_and_blobs::SignedBeaconBlockAndBlobsSidecar;
 pub use crate::signed_block_and_blobs::SignedBeaconBlockAndBlobsSidecarDecode;
 pub use crate::signed_bls_to_execution_change::SignedBlsToExecutionChange;

consensus/types/src/signed_blob.rs

@@ -0,0 +1,24 @@
+use crate::{test_utils::TestRandom, BlobSidecar, EthSpec, Signature};
+use serde_derive::{Deserialize, Serialize};
+use ssz_derive::{Decode, Encode};
+use test_random_derive::TestRandom;
+use tree_hash_derive::TreeHash;
+
+#[derive(
+    Debug,
+    Clone,
+    PartialEq,
+    Serialize,
+    Deserialize,
+    Encode,
+    Decode,
+    TestRandom,
+    TreeHash,
+    arbitrary::Arbitrary,
+)]
+#[serde(bound = "T: EthSpec")]
+#[arbitrary(bound = "T: EthSpec")]
+pub struct SignedBlobSidecar<T: EthSpec> {
+    pub blob: BlobSidecar<T>,
+    pub signature: Signature,
+}