reorg: move JS ops implementations to cli/js/ops/, part 3 (#4302)

Following JS ops were moved to separate files in cli/js/ops directory:
- net
- tls
- fs

cli/js/ops/fs/rename.ts

@@ -0,0 +1,25 @@
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
+import { sendSync, sendAsync } from "../dispatch_json.ts";
+
+/** Synchronously renames (moves) `oldpath` to `newpath`. If `newpath` already
+ * exists and is not a directory, `renameSync()` replaces it. OS-specific
+ * restrictions may apply when `oldpath` and `newpath` are in different
+ * directories.
+ *
+ *       Deno.renameSync("old/path", "new/path");
+ *
+ * Requires `allow-read` and `allow-write` permissions. */
+export function renameSync(oldpath: string, newpath: string): void {
+  sendSync("op_rename", { oldpath, newpath });
+}
+
+/** Renames (moves) `oldpath` to `newpath`. If `newpath` already exists and is
+ * not a directory, `rename()` replaces it. OS-specific restrictions may apply
+ * when `oldpath` and `newpath` are in different directories.
+ *
+ *       await Deno.rename("old/path", "new/path");
+ *
+ * Requires `allow-read` and `allow-write`. */
+export async function rename(oldpath: string, newpath: string): Promise<void> {
+  await sendAsync("op_rename", { oldpath, newpath });
+}