This reverts commit 2fdfa29e.

Allows the creation of virtual in-app keyboards written in Flutter.  Especially useful for embedded environments.

This implements a MenuBar widget that can render a Material menu bar, and a MenuAnchor widget used to create a cascading menu in a region. The menus are drawn in the overlay, while the menu bar itself is in the regular widget tree. Keyboard traversal works between the two.

This implementation of the MenuBar uses MenuAnchor to create a cascading menu that contains widgets representing the menu items. These menu items can be any kind of widget, but are typically SubmenuButtons that host submenus, or MenuItemButtons that have shortcut hints (but don't actually activate the shortcuts) and don't host submenus.

Cascading menus can be created outside of a MenuBar by using a MenuAnchor. They can be either given a specific location to appear (a coordinate), or they can be located by the MenuAnchor region that wraps the control that opens them.

The developer may also create a MenuController to pass to the various menu primitives (MenuBar or MenuAnchor) to associate menus so that they can be traversed together and closed together. Creating a controller is not required.

This reverts commit 7242ea22.

* Add covariant to `ThemeExtension.lerp`

* x

* x

This reverts commit 79013b2b.

* Add clipBehavior to Card+InkWell example

* Add test for example

* Update comment

This reverts commit b3aba4d9 because it breaks Google tests.

* Revert "Revert "Set `IconButton.visualDensity` default to `VisualDensity.standard` (#109349)" (#109421)"
Co-authored-by: Qun Cheng <quncheng@google.com>