Use optimistic confirmation in getSignatureStatuses, and various downstream client methods (#14430)

* Add optimistically_confirmed field to TransactionStatus

* Update docs

* Convert new field to confirmation_status

* Update docs to confirmationStatus

* Update variants

* Update docs

* Just Confirmed

banks-interface/src/lib.rs

@@ -10,11 +10,19 @@ use solana_sdk::{
     transaction::{self, Transaction, TransactionError},
 };
 
+#[derive(Clone, Debug, PartialEq, Serialize, Deserialize)]
+pub enum TransactionConfirmationStatus {
+    Processed,
+    Confirmed,
+    Finalized,
+}
+
 #[derive(Clone, Debug, PartialEq, Serialize, Deserialize)]
 pub struct TransactionStatus {
     pub slot: Slot,
     pub confirmations: Option<usize>, // None = rooted
     pub err: Option<TransactionError>,
+    pub confirmation_status: Option<TransactionConfirmationStatus>,
 }
 
 #[tarpc::service]