Detect and notify when deserializable shreds are available (#11816)

* Add logic to check for complete data ranges

* Add RPC signature notification

Co-authored-by: Carl <carl@solana.com>

client/src/rpc_response.rs

@@ -94,9 +94,16 @@ pub struct RpcKeyedAccount {
     pub account: UiAccount,
 }
 
+#[derive(Serialize, Deserialize, Clone, Debug)]
+#[serde(rename_all = "camelCase", tag = "type", content = "result")]
+pub enum RpcSignatureResult {
+    ProcessedSignatureResult(ProcessedSignatureResult),
+    ReceivedSignature,
+}
+
 #[derive(Serialize, Deserialize, Clone, Debug)]
 #[serde(rename_all = "camelCase")]
-pub struct RpcSignatureResult {
+pub struct ProcessedSignatureResult {
     pub err: Option<TransactionError>,
 }