MDC-Android shape theme attributes

mdc_shape_theme_attrs.xml

<!-- Copyright 2020 Google LLC.
   SPDX-License-Identifier: Apache-2.0 -->

<!-- In res/values/themes.xml -->
<style name="Theme.App.Base" parent="Theme.MaterialComponents.*">
    ...
    <item name="shapeAppearanceSmallComponent">
        @style/ShapeAppearance.App.SmallComponent
    </item>
    <item name="shapeAppearanceMediumComponent">
        @style/ShapeAppearance.App.MediumComponent
    </item>
    <item name="shapeAppearanceLargeComponent">
        @style/ShapeAppearance.App.LargeComponent
    </item>
</style>