[webdriver] Move Webdriver to ServoShell (#36714)

Moving `webdriver` to `servoshell`:

- Let `servoshell` manage lifecycle of `webdriver`
- One by one, move the handling of webdriver commands from
`constellation` to `embedder`

Partially fix: https://github.com/servo/servo/issues/37370
Partially fix webdriver test timeout with `no_top_browsing_context`

cc: @xiaochengh

---------

Signed-off-by: batu_hoang <longvatrong111@gmail.com>

Cargo.lock

@@ -7191,6 +7191,8 @@ dependencies = [
  "backtrace",
  "cc",
  "cfg-if",
+ "constellation_traits",
+ "crossbeam-channel",
  "dirs",
  "dpi",
  "egui",
@@ -7237,6 +7239,7 @@ dependencies = [
  "tracing-perfetto",
  "tracing-subscriber",
  "url",
+ "webdriver_server",
  "windows-sys 0.59.0",
  "winit",
  "winres",