Add getConfirmedSignaturesForAddress2 RPC method (bp #11259) (#11394)

* Add getConfirmedSignaturesForAddress2 RPC method

(cherry picked from commit 1b2276520b)

* Reimplement transaction-history command with getConfirmedSignaturesForAddress2

(cherry picked from commit 087fd32ce3)

* Rework get_confirmed_signatures_for_address2

(cherry picked from commit a11f137810)

* Rename startAfter to before

(cherry picked from commit 02c0981ecf)

Co-authored-by: Michael Vines <mvines@gmail.com>

client/src/rpc_config.rs

@@ -65,3 +65,10 @@ pub enum RpcTokenAccountsFilter {
     Mint(String),
     ProgramId(String),
 }
+
+#[derive(Debug, Clone, Default, PartialEq, Serialize, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct RpcGetConfirmedSignaturesForAddress2Config {
+    pub before: Option<String>, // Signature as base-58 string
+    pub limit: Option<usize>,
+}