component: Component crate cleanup (#29967)

This PR further organizes and documents the component crate. It:

- Simplifies the component registry
- Gives access to `ComponentMetadata` sooner
- Enables lookup by id in preview extension implementations
(`ComponentId` -> `ComponentMetadata`)
- Should slightly improve the performance of ComponentPreview

It also brings component statuses to the Component trait:

![CleanShot 2025-05-05 at 23 27
11@2x](https://github.com/user-attachments/assets/dd95ede6-bc90-4de4-90c6-3e5e064fd676)

![CleanShot 2025-05-05 at 23 27
40@2x](https://github.com/user-attachments/assets/9520aece-04c2-418b-95e1-c11aa60a66ca)

![CleanShot 2025-05-05 at 23 27
57@2x](https://github.com/user-attachments/assets/db1713d5-9831-4d00-9b29-1fd51c25fcba)

Release Notes:

- N/A

crates/ui/src/component_prelude.rs

@@ -1,5 +1,6 @@
 pub use component::{
-    Component, ComponentScope, example_group, example_group_with_title, single_example,
+    Component, ComponentId, ComponentScope, ComponentStatus, example_group,
+    example_group_with_title, single_example,
 };
 pub use documented::Documented;
 pub use ui_macros::RegisterComponent;

crates/ui/src/components/notification/alert_modal.rs

@@ -1,3 +1,4 @@
+use crate::component_prelude::*;
 use crate::prelude::*;
 use gpui::IntoElement;
 use smallvec::{SmallVec, smallvec};
@@ -81,6 +82,10 @@ impl Component for AlertModal {
         ComponentScope::Notification
     }
 
+    fn status() -> ComponentStatus {
+        ComponentStatus::WorkInProgress
+    }
+
     fn description() -> Option<&'static str> {
         Some("A modal dialog that presents an alert message with primary and dismiss actions.")
     }