Move RpcClient to zed_rpc and rename it to Peer

Co-Authored-By: Nathan Sobo <nathan@zed.dev>

zed/src/test.rs

@@ -1,6 +1,4 @@
-use crate::{
-    language::LanguageRegistry, rpc_client::RpcClient, settings, time::ReplicaId, AppState,
-};
+use crate::{language::LanguageRegistry, settings, time::ReplicaId, AppState};
 use ctor::ctor;
 use gpui::AppContext;
 use rand::Rng;
@@ -152,6 +150,6 @@ pub fn build_app_state(cx: &AppContext) -> AppState {
     AppState {
         settings,
         language_registry,
-        rpc_client: RpcClient::new(),
+        rpc: zed_rpc::Peer::new(),
     }
 }