leader qos part 2: add stage to find sender stake, set to packet meta

sdk/src/packet.rs

@@ -32,7 +32,7 @@ pub struct Meta {
     pub addr: IpAddr,
     pub port: u16,
     pub flags: PacketFlags,
-    pub weight: u64,
+    pub sender_stake: u64,
 }
 
 #[derive(Clone)]
@@ -146,7 +146,7 @@ impl Default for Meta {
             addr: IpAddr::V4(Ipv4Addr::UNSPECIFIED),
             port: 0,
             flags: PacketFlags::empty(),
-            weight: 0,
+            sender_stake: 0,
         }
     }
 }