Convert Blockstore Rewards cf to protobuf (#12860)

* Add Blockstore protobuf cf type

* Add Rewards message to proto and make generated pub

* Convert Rewards cf to ProtobufColumn

* Add bench

* Adjust tags

* Move solana proto definitions and conversion methods to new crate

storage-proto/src/lib.rs

@@ -0,0 +1,52 @@
+use serde::{Deserialize, Serialize};
+use solana_sdk::deserialize_utils::default_on_eof;
+use solana_transaction_status::{Reward, RewardType};
+
+pub mod convert;
+
+pub type StoredExtendedRewards = Vec<StoredExtendedReward>;
+
+#[derive(Serialize, Deserialize)]
+pub struct StoredExtendedReward {
+    pubkey: String,
+    lamports: i64,
+    #[serde(deserialize_with = "default_on_eof")]
+    post_balance: u64,
+    #[serde(deserialize_with = "default_on_eof")]
+    reward_type: Option<RewardType>,
+}
+
+impl From<StoredExtendedReward> for Reward {
+    fn from(value: StoredExtendedReward) -> Self {
+        let StoredExtendedReward {
+            pubkey,
+            lamports,
+            post_balance,
+            reward_type,
+        } = value;
+        Self {
+            pubkey,
+            lamports,
+            post_balance,
+            reward_type,
+        }
+    }
+}
+
+impl From<Reward> for StoredExtendedReward {
+    fn from(value: Reward) -> Self {
+        let Reward {
+            pubkey,
+            lamports,
+            post_balance,
+            reward_type,
+            ..
+        } = value;
+        Self {
+            pubkey,
+            lamports,
+            post_balance,
+            reward_type,
+        }
+    }
+}