Add ConfirmedBlock struct, and rework Blocktree apis to include block… (#7004)

* Add RpcConfirmedBlock struct, and rework Blocktree apis to include blockhash info and dummy tx statuses

* Remove unused lifetime

client/src/rpc_request.rs

@@ -3,6 +3,8 @@ use serde_json::{json, Value};
 use solana_sdk::{
     clock::{Epoch, Slot},
     commitment_config::CommitmentConfig,
+    hash::Hash,
+    transaction::{Result, Transaction},
 };
 use std::{error, fmt, io, net::SocketAddr};
 
@@ -20,6 +22,13 @@ pub struct Response<T> {
     pub value: T,
 }
 
+#[derive(Debug, Default, PartialEq, Serialize)]
+pub struct RpcConfirmedBlock {
+    pub previous_blockhash: Hash,
+    pub blockhash: Hash,
+    pub transactions: Vec<(Transaction, Result<()>)>,
+}
+
 #[derive(Serialize, Deserialize, Clone, Debug)]
 pub struct RpcContactInfo {
     /// Pubkey of the node as a base-58 string