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/symlink.ts

@@ -1,44 +0,0 @@
-// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
-import { sendSync, sendAsync } from "./ops/dispatch_json.ts";
-import * as util from "./util.ts";
-import { build } from "./build.ts";
-
-/** **UNSTABLE**: `type` argument type may be changed to `"dir" | "file"`.
- *
- * Creates `newname` as a symbolic link to `oldname`. The type argument can be
- * set to `dir` or `file`. Is only available on Windows and ignored on other
- * platforms.
- *
- *       Deno.symlinkSync("old/name", "new/name");
- *
- * Requires `allow-read` and `allow-write` permissions. */
-export function symlinkSync(
-  oldname: string,
-  newname: string,
-  type?: string
-): void {
-  if (build.os === "win" && type) {
-    return util.notImplemented();
-  }
-  sendSync("op_symlink", { oldname, newname });
-}
-
-/** **UNSTABLE**: `type` argument may be changed to "dir" | "file"
- *
- * Creates `newname` as a symbolic link to `oldname`. The type argument can be
- * set to `dir` or `file`. Is only available on Windows and ignored on other
- * platforms.
- *
- *       await Deno.symlink("old/name", "new/name");
- *
- * Requires `allow-read` and `allow-write` permissions. */
-export async function symlink(
-  oldname: string,
-  newname: string,
-  type?: string
-): Promise<void> {
-  if (build.os === "win" && type) {
-    return util.notImplemented();
-  }
-  await sendAsync("op_symlink", { oldname, newname });
-}