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/platform/mac/platform.rs

@@ -1,14 +1,14 @@
 use super::{
     attributed_string::{NSAttributedString, NSMutableAttributedString},
     events::key_to_native,
-    renderer, screen_capture, BoolExt,
+    BoolExt,
 };
 use crate::{
     hash, Action, AnyWindowHandle, BackgroundExecutor, ClipboardEntry, ClipboardItem,
     ClipboardString, CursorStyle, ForegroundExecutor, Image, ImageFormat, Keymap, MacDispatcher,
     MacDisplay, MacWindow, Menu, MenuItem, PathPromptOptions, Platform, PlatformDisplay,
-    PlatformTextSystem, PlatformWindow, Result, ScreenCaptureSource, SemanticVersion, Task,
-    WindowAppearance, WindowParams,
+    PlatformTextSystem, PlatformWindow, Result, SemanticVersion, Task, WindowAppearance,
+    WindowParams,
 };
 use anyhow::anyhow;
 use block::ConcreteBlock;
@@ -58,6 +58,8 @@ use std::{
 };
 use strum::IntoEnumIterator;
 
+use super::renderer;
+
 #[allow(non_upper_case_globals)]
 const NSUTF8StringEncoding: NSUInteger = 4;
 
@@ -548,12 +550,6 @@ impl Platform for MacPlatform {
             .collect()
     }
 
-    fn screen_capture_sources(
-        &self,
-    ) -> oneshot::Receiver<Result<Vec<Box<dyn ScreenCaptureSource>>>> {
-        screen_capture::get_sources()
-    }
-
     fn active_window(&self) -> Option<AnyWindowHandle> {
         MacWindow::active_window()
     }