Update getSignatureStatus: support multiple signatures, include slot in each response item (#9022)

* Rename enable-rpc-get-confirmed-block

* Rename RpcTransactionStatus -> RpcTransactionStatusMeta

* Return simplified RpcTransactionStatus; Add support for multiple transactions

* Update docs

* typo

multinode-demo/bootstrap-validator.sh

@@ -42,7 +42,7 @@ while [[ -n $1 ]]; do
     elif [[ $1 = --no-rocksdb-compaction ]]; then
       args+=("$1")
       shift
-    elif [[ $1 = --enable-rpc-get-confirmed-block ]]; then
+    elif [[ $1 = --enable-rpc-transaction-history ]]; then
       args+=("$1")
       shift
     elif [[ $1 = --skip-poh-verify ]]; then