extensions_ui: Add general structure for filtering extensions by what they provide (#24325)

This PR adds the general structure for filtering the extensions list by
what the extensions provide.

Currently flagged for Zed staff until we get some design direction on
how best to present the filter.

Release Notes:

- N/A

crates/rpc/src/extension.rs

@@ -19,7 +19,18 @@ pub struct ExtensionApiManifest {
 }
 
 #[derive(
-    Debug, PartialEq, Eq, PartialOrd, Ord, Hash, Clone, Copy, Serialize, Deserialize, EnumString,
+    Debug,
+    PartialEq,
+    Eq,
+    PartialOrd,
+    Ord,
+    Hash,
+    Clone,
+    Copy,
+    Serialize,
+    Deserialize,
+    EnumString,
+    strum::Display,
 )]
 #[serde(rename_all = "kebab-case")]
 #[strum(serialize_all = "kebab-case")]