context servers: Show configuration modal when extension is installed (#29309)

WIP

Release Notes:

- N/A

---------

Co-authored-by: Danilo Leal <67129314+danilo-leal@users.noreply.github.com>
Co-authored-by: Danilo Leal <daniloleal09@gmail.com>
Co-authored-by: Marshall Bowers <git@maxdeviant.com>
Co-authored-by: Cole Miller <m@cole-miller.net>
Co-authored-by: Antonio Scandurra <me@as-cii.com>
Co-authored-by: Oleksiy Syvokon <oleksiy.syvokon@gmail.com>

crates/extension/src/extension.rs

@@ -121,6 +121,12 @@ pub trait Extension: Send + Sync + 'static {
         project: Arc<dyn ProjectDelegate>,
     ) -> Result<Command>;
 
+    async fn context_server_configuration(
+        &self,
+        context_server_id: Arc<str>,
+        project: Arc<dyn ProjectDelegate>,
+    ) -> Result<Option<ContextServerConfiguration>>;
+
     async fn suggest_docs_packages(&self, provider: Arc<str>) -> Result<Vec<String>>;
 
     async fn index_docs(