Revert "Use livekit's Rust SDK instead of their swift SDK (#13343)" (#20809)

Issues found:

* audio does not work well with various set-ups using USB
* switching audio during initial join may leave the client with no audio
at all
* audio streaming is done on the main thread, beachballing certain
set-ups
* worse screenshare quality (seems that there's no dynamic scaling
anymore, compared to the Swift SDK)

This reverts commit 1235d0808e.

Release Notes:

- N/A

crates/gpui/src/geometry.rs

@@ -704,11 +704,6 @@ pub struct Bounds<T: Clone + Default + Debug> {
     pub size: Size<T>,
 }
 
-/// Create a bounds with the given origin and size
-pub fn bounds<T: Clone + Default + Debug>(origin: Point<T>, size: Size<T>) -> Bounds<T> {
-    Bounds { origin, size }
-}
-
 impl Bounds<Pixels> {
     /// Generate a centered bounds for the given display or primary display if none is provided
     pub fn centered(display_id: Option<DisplayId>, size: Size<Pixels>, cx: &AppContext) -> Self {