Add getTokenLargestAccounts endpoint (bp #11322) (#11338)

* Add getTokenLargestAccounts endpoint (#11322)


(cherry picked from commit d1b2e6cdf2)

* Rebase on v1.2

Co-authored-by: Tyera Eulberg <teulberg@gmail.com>
Co-authored-by: Tyera Eulberg <tyera@solana.com>

client/src/rpc_response.rs

@@ -219,3 +219,10 @@ pub struct RpcStakeActivation {
     pub active: u64,
     pub inactive: u64,
 }
+
+#[derive(Serialize, Deserialize, Clone, Debug, PartialEq)]
+#[serde(rename_all = "camelCase")]
+pub struct RpcTokenAccountBalance {
+    pub address: String,
+    pub amount: u64,
+}