Added interface type for Cloudflare pipelines binding (cloudflare#2654)

* Added interface type for cloudflare pipelines binding

* Adding pipelines binding types

---------

Co-authored-by: Oli Yu <oli@cloudflare.com>

types/defines/pipelines.d.ts

@@ -0,0 +1,13 @@
+// Copyright (c) 2022-2023 Cloudflare, Inc.
+// Licensed under the Apache 2.0 license found in the LICENSE file or at:
+//     https://opensource.org/licenses/Apache-2.0
+
+export interface Pipeline {
+  /**
+   * send takes an array of javascript objects which are
+   * then received by the pipeline for processing
+   *
+   * @param data The data to be sent
+   */
+  send(data: object[]): Promise<void>
+}