[Compound] Implement dialogs (#1043)

* Implement dialogs following Compound tokens

* Update screenshots

* Fix confirmation dialog preview

* Update screenshots

* Add changelog

* Add Figma designs link

---------

Co-authored-by: ElementBot <benoitm+elementbot@element.io>

libraries/theme/src/main/kotlin/io/element/android/libraries/theme/ElementTheme.kt

@@ -68,6 +68,14 @@ object ElementTheme {
      */
     val typography: TypographyTokens = TypographyTokens
 
+    /**
+     * Material 3 [Typography] tokens. In Figma, these have the `M3 Typography/` prefix.
+     */
+    val materialTypography: Typography
+        @Composable
+        @ReadOnlyComposable
+        get()= MaterialTheme.typography
+
     /**
      * Returns whether the theme version used is the light or the dark one.
      */