Implement HTMLDocument API (#38433)

This updates the pull request from here
https://github.com/servo/servo/pull/32553 that looks to be dormant. The
main change is that I've switched out `reflector` with `document` based
off this suggestion
https://github.com/servo/servo/pull/32553#issuecomment-2179568743, and
the `GetLocation` and `SupportedPropertyNames` methods pass through the
values from `Document`.

The implementation details are otherwise the same as the original PR

Testing: I don't see any WPT tests for this feature, I could make a
custom test if desired
Fixes: https://github.com/servo/servo/issues/32536

---------

Signed-off-by: Leo Ring <leoring03@gmail.com>

components/script_bindings/webidls/HTMLDocument.webidl

@@ -0,0 +1,13 @@
+/* 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 http://mozilla.org/MPL/2.0/.
+ */
+
+// https://html.spec.whatwg.org/multipage/#htmldocument
+
+[LegacyOverrideBuiltIns,
+ Exposed=Window]
+interface HTMLDocument : Document {
+  // DOM tree accessors
+  getter NamedPropertyValue (DOMString name);
+};