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/livekit_server/Cargo.toml

@@ -0,0 +1,30 @@
+[package]
+name = "livekit_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/livekit_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"]