Desktop: Isolate CEF-rendered UI into separate crate and process (#4321)

* Extract CEF rendered UI into a separate process and crate

* Review

* Review

* Review

* Review

* Remove necessary workarounds

* Block on frame copy ack

* Crop and resample frames correctly

* Skip blank frames

* Fix deps

* Fix fmt

* Fix clippy warning

* Review

* Fix todo

desktop/ui/src/frames.rs

@@ -0,0 +1,14 @@
+#[cfg(feature = "accelerated_paint")]
+pub(crate) mod import;
+#[cfg(feature = "accelerated_paint")]
+pub(crate) mod plane;
+pub(crate) mod receive;
+#[cfg(feature = "accelerated_paint")]
+mod resample;
+pub(crate) mod sequence;
+pub(crate) mod sink;
+mod streamer;
+mod surface;
+
+pub(crate) use streamer::FrameStreamer;
+pub(crate) use surface::FrameSurface;