Convert StatusBarRegistration to use components field (#1598)

* Convert StatusBarRegistration to use components field

- More similar to all other *Registration types for extensions

- Simpler fix for using the components.Icon type, now accepts functions
  that return component instance like all other *Registration types

- Kept old fix for backwards compatability

Signed-off-by: Sebastian Malton <sebastian@malton.name>

* fix docs

Signed-off-by: Sebastian Malton <sebastian@malton.name>

src/extensions/registries/status-bar-registry.ts

@@ -3,7 +3,18 @@
 import React from "react";
 import { BaseRegistry } from "./base-registry";
 
-export interface StatusBarRegistration {
+interface StatusBarComponents {
+  Item?: React.ComponentType;
+}
+
+interface StatusBarRegistrationV2 {
+  components: StatusBarComponents;
+}
+
+export interface StatusBarRegistration extends StatusBarRegistrationV2 {
+  /**
+   * @deprecated use components.Item instead
+   */
   item?: React.ReactNode;
 }