Rename SharedUrl to SharedUri (#7084)

This PR renames `SharedUrl` to `SharedUri` to better reflect its intent.

I'm still not entirely happy with this naming, as the file paths that we
can store in here are not _really_ URIs, as they are lacking a protocol.

I want to explore changing `SharedUri` / `SharedUrl` back to alway
storing a URL and treat local filepaths differently, as it seems we're
conflating two different concerns under the same umbrella, at the
moment.

Release Notes:

- N/A

crates/client/src/user.rs

@@ -4,7 +4,7 @@ use collections::{hash_map::Entry, HashMap, HashSet};
 use feature_flags::FeatureFlagAppExt;
 use futures::{channel::mpsc, Future, StreamExt};
 use gpui::{
-    AppContext, AsyncAppContext, EventEmitter, Model, ModelContext, SharedString, SharedUrl, Task,
+    AppContext, AsyncAppContext, EventEmitter, Model, ModelContext, SharedString, SharedUri, Task,
     WeakModel,
 };
 use postage::{sink::Sink, watch};
@@ -22,7 +22,7 @@ pub struct ParticipantIndex(pub u32);
 pub struct User {
     pub id: UserId,
     pub github_login: String,
-    pub avatar_uri: SharedUrl,
+    pub avatar_uri: SharedUri,
 }
 
 #[derive(Clone, Debug, PartialEq, Eq)]
@@ -707,7 +707,7 @@ impl User {
         Arc::new(User {
             id: message.id,
             github_login: message.github_login,
-            avatar_uri: SharedUrl::network(message.avatar_url),
+            avatar_uri: SharedUri::network(message.avatar_url),
         })
     }
 }