feat: refactor Sidebar into standalone reusable component (#5663)

🚀!

src/components/Sidebar/common.ts

@@ -0,0 +1,22 @@
+import React from "react";
+
+export type SidebarProps<P = {}> = {
+  children: React.ReactNode;
+  /**
+   * Called on sidebar close (either by user action or by the editor).
+   */
+  onClose?: () => void | boolean;
+  /** if not supplied, sidebar won't be dockable */
+  onDock?: (docked: boolean) => void;
+  docked?: boolean;
+  dockable?: boolean;
+  className?: string;
+} & P;
+
+export type SidebarPropsContextValue = Pick<
+  SidebarProps,
+  "onClose" | "onDock" | "docked" | "dockable"
+>;
+
+export const SidebarPropsContext =
+  React.createContext<SidebarPropsContextValue>({});