Use LiveKit's Rust SDK on Linux while continue using Swift SDK on Mac (#21550)

Similar to #20826 but keeps the Swift implementation. There were quite a
few changes in the `call` crate, and so that code now has two variants.

Closes #13714

Release Notes:

- Added preliminary Linux support for voice chat and viewing
screenshares.

---------

Co-authored-by: Kirill Bulatov <mail4score@gmail.com>
Co-authored-by: Kirill Bulatov <kirill@zed.dev>
Co-authored-by: Mikayla <mikayla@zed.dev>

crates/live_kit_server/Cargo.toml

@@ -1,30 +0,0 @@
-[package]
-name = "live_kit_server"
-version = "0.1.0"
-edition = "2021"
-description = "SDK for the LiveKit server API"
-publish = false
-license = "AGPL-3.0-or-later"
-
-[lints]
-workspace = true
-
-[lib]
-path = "src/live_kit_server.rs"
-doctest = false
-
-[dependencies]
-anyhow.workspace = true
-async-trait.workspace = true
-jsonwebtoken.workspace = true
-log.workspace = true
-prost.workspace = true
-prost-types.workspace = true
-reqwest.workspace = true
-serde.workspace = true
-
-[build-dependencies]
-prost-build.workspace = true
-
-[package.metadata.cargo-machete]
-ignored = ["prost-types"]