DevTools: Show HTML tree (#32655)

* feat: watch root node

Signed-off-by: eri <eri@inventati.org>

* reafactor: divide inspector in components

Signed-off-by: eri <eri@inventati.org>

* feat: add css properties actor

Signed-off-by: eri <eri@inventati.org>

* feat: accesibility actor

Signed-off-by: eri <eri@inventati.org>

* feat: layout actor

Signed-off-by: eri <eri@inventati.org>

* feat: network parent and refactor

Signed-off-by: eri <eri@inventati.org>

* feat: progress on the inspector messages

Signed-off-by: eri <eri@inventati.org>

* feat: more progress on inspector

Signed-off-by: eri <eri@inventati.org>

* feat: try to fix nodes showing

Signed-off-by: eri <eri@inventati.org>

* feat: initial dom tree

Signed-off-by: eri <eri@inventati.org>

* feat: some more messages

Signed-off-by: eri <eri@inventati.org>

* feat: clean and add documentation

Signed-off-by: eri <eri@inventati.org>

* refactor: add more docs and clean

Signed-off-by: eri <eri@inventati.org>

* fix: restore deleted node attributes field

Signed-off-by: eri <eri@inventati.org>

* Apply suggestions from code review

Fix a few nits in comments

Signed-off-by: Martin Robinson <mrobinson@igalia.com>

---------

Signed-off-by: eri <eri@inventati.org>
Signed-off-by: Martin Robinson <mrobinson@igalia.com>
Co-authored-by: Martin Robinson <mrobinson@igalia.com>

components/devtools/actors/performance.rs

@@ -2,6 +2,9 @@
  * 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/. */
 
+// TODO: Is this actor still relevant?
+#![allow(dead_code)]
+
 use std::net::TcpStream;
 
 use serde::Serialize;