Move ChannelList, UserStore into client crate

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

crates/client/src/http.rs

@@ -0,0 +1,26 @@
+pub use anyhow::{anyhow, Result};
+use futures::future::BoxFuture;
+use std::sync::Arc;
+pub use surf::{
+    http::{Method, Response as ServerResponse},
+    Request, Response, Url,
+};
+
+pub trait HttpClient: Send + Sync {
+    fn send<'a>(&'a self, req: Request) -> BoxFuture<'a, Result<Response>>;
+}
+
+pub fn client() -> Arc<dyn HttpClient> {
+    Arc::new(surf::client())
+}
+
+impl HttpClient for surf::Client {
+    fn send<'a>(&'a self, req: Request) -> BoxFuture<'a, Result<Response>> {
+        Box::pin(async move {
+            Ok(self
+                .send(req)
+                .await
+                .map_err(|e| anyhow!("http request failed: {}", e))?)
+        })
+    }
+}