Rpc: enable getConfirmedSignaturesForAddress2 to return confirmed (not yet finalized) data (#16281) (#16293)

* Update blockstore method to allow return of unfinalized signature

* Support confirmed sigs in getConfirmedSignaturesForAddress2

* Add deprecated comments

* Update docs

* Enable confirmed transaction-history in cli

* Return real confirmation_status; fill in not-yet-finalized block time if possible

(cherry picked from commit da27acabcc)

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

client/src/rpc_config.rs

@@ -109,6 +109,8 @@ pub struct RpcGetConfirmedSignaturesForAddress2Config {
     pub before: Option<String>, // Signature as base-58 string
     pub until: Option<String>,  // Signature as base-58 string
     pub limit: Option<usize>,
+    #[serde(flatten)]
+    pub commitment: Option<CommitmentConfig>,
 }
 
 #[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]