Fix gossip messages growing beyond blob size (#5460)

* fixed bloom filter math

* Add split each pull request into multiple pulls with different filters

* Rework CrdsFilter to generate all possible masks to cover the keyspace

* Limit the bloom sizes such that each pull request is no larger than mtu

core/src/packet.rs

@@ -335,7 +335,9 @@ pub fn to_blob<T: Serialize>(resp: T, rsp_addr: SocketAddr) -> Result<Blob> {
     let mut b = Blob::default();
     let v = bincode::serialize(&resp)?;
     let len = v.len();
-    assert!(len <= BLOB_SIZE);
+    if len > BLOB_SIZE {
+        return Err(Error::ToBlobError);
+    }
     b.data[..len].copy_from_slice(&v);
     b.meta.size = len;
     b.meta.set_addr(&rsp_addr);