Revert "Apply transaction batches in periodic intervals (#4504)"

This reverts commit b580049ec0.

src/ripple/basics/SubmitSync.h

@@ -1,41 +0,0 @@
-//------------------------------------------------------------------------------
-/*
-    This file is part of rippled: https://github.com/ripple/rippled
-    Copyright (c) 2023 Ripple Labs Inc.
-
-    Permission to use, copy, modify, and/or distribute this software for any
-    purpose  with  or without fee is hereby granted, provided that the above
-    copyright notice and this permission notice appear in all copies.
-
-    THE  SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
-    WITH  REGARD  TO  THIS  SOFTWARE  INCLUDING  ALL  IMPLIED  WARRANTIES  OF
-    MERCHANTABILITY  AND  FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
-    ANY  SPECIAL ,  DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
-    WHATSOEVER  RESULTING  FROM  LOSS  OF USE, DATA OR PROFITS, WHETHER IN AN
-    ACTION  OF  CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
-    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
-*/
-//==============================================================================
-
-#ifndef RIPPLE_BASICS_SUBMITSYNC_H_INCLUDED
-#define RIPPLE_BASICS_SUBMITSYNC_H_INCLUDED
-
-namespace ripple {
-namespace RPC {
-
-/**
- * Possible values for defining synchronous behavior of the transaction
- * submission API.
- *   1) sync (default): Process transactions in a batch immediately,
- *       and return only once the transaction has been processed.
- *   2) async: Put transaction into the batch for the next processing
- *       interval and return immediately.
- *   3) wait: Put transaction into the batch for the next processing
- *       interval and return only after it is processed.
- */
-enum class SubmitSync { sync, async, wait };
-
-}  // namespace RPC
-}  // namespace ripple
-
-#endif