Rename livekit_server to livekit_api (#24984)

The name `livekit_server` was a bit misleading as it is not a server and
gets built into both the client and server - the server code is in
`collab`.

Release Notes:

- N/A

crates/livekit_server/Cargo.toml

@@ -1,30 +0,0 @@
-[package]
-name = "livekit_server"
-version = "0.1.0"
-edition.workspace = true
-description = "SDK for the LiveKit server API"
-publish.workspace = true
-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"]