script: initial CookieStore implementation (#37968)

This is a first draft at implementing the required infrastructure for
CookieStore, which requires setting up IPC between script and the
resource thread to allow for async/"in parallel" handling of cookie
changes that have a promise API.

Cookie Store also will need to receive change events when cookies for a
url are changed so the architecture needs to support that.

Expect this PR to be reworked once the architecture becomes more
settled, cookie change events will be implemented in follow up PRs

Testing: WPT tests exist for this API
Part of #37674

---------

Signed-off-by: Sebastian C <sebsebmc@gmail.com>

components/script_bindings/webidls/CookieStore.webidl

@@ -0,0 +1,71 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
+
+// https://cookiestore.spec.whatwg.org/
+
+[Exposed=(ServiceWorker,Window),
+ SecureContext,
+ Pref="dom_cookiestore_enabled"]
+interface CookieStore : EventTarget {
+  Promise<CookieListItem?> get(USVString name);
+  Promise<CookieListItem?> get(optional CookieStoreGetOptions options = {});
+
+  Promise<CookieList> getAll(USVString name);
+  Promise<CookieList> getAll(optional CookieStoreGetOptions options = {});
+
+  Promise<undefined> set(USVString name, USVString value);
+  Promise<undefined> set(CookieInit options);
+
+  Promise<undefined> delete(USVString name);
+  Promise<undefined> delete(CookieStoreDeleteOptions options);
+
+  // [Exposed=Window]
+  // attribute EventHandler onchange;
+};
+
+dictionary CookieStoreGetOptions {
+  USVString name;
+  USVString url;
+};
+
+enum CookieSameSite {
+  "strict",
+  "lax",
+  "none"
+};
+
+dictionary CookieInit {
+  required USVString name;
+  required USVString value;
+  DOMHighResTimeStamp? expires = null;
+  USVString? domain = null;
+  USVString path = "/";
+  CookieSameSite sameSite = "strict";
+  boolean partitioned = false;
+};
+
+dictionary CookieStoreDeleteOptions {
+  required USVString name;
+  USVString? domain = null;
+  USVString path = "/";
+  boolean partitioned = false;
+};
+
+dictionary CookieListItem {
+  USVString name;
+  USVString value;
+  USVString? domain;
+  USVString path;
+  DOMHighResTimeStamp? expires;
+  boolean secure;
+  CookieSameSite sameSite;
+  boolean partitioned;
+};
+
+typedef sequence<CookieListItem> CookieList;
+
+[SecureContext]
+partial interface Window {
+  [SameObject, Pref="dom_cookiestore_enabled"] readonly attribute CookieStore cookieStore;
+};