extensions_ui: Add ability to filter extensions by category (#27005)

This PR adds the ability to filter the list of extensions by category:


https://github.com/user-attachments/assets/ea7b518e-4769-4e2e-8bbe-e75f9f01edf9

Release Notes:

- Added the ability to filter the list of extensions by category.

crates/rpc/src/extension.rs

@@ -31,6 +31,7 @@ pub struct ExtensionApiManifest {
     Deserialize,
     EnumString,
     strum::Display,
+    strum::EnumIter,
 )]
 #[serde(rename_all = "kebab-case")]
 #[strum(serialize_all = "kebab-case")]