fix(tokens): add forwards for top app bar variants

Author: zZHorizonZz

tokens/_index.scss

@@ -55,6 +55,10 @@
 @forward './md-comp-switch' as md-comp-switch-*;
 @forward './md-comp-test-table' as md-comp-test-table-*;
 @forward './md-comp-text-button' as md-comp-text-button-*;
+@forward './md-comp-top-app-bar-large' as md-comp-top-app-bar-large-*;
+@forward './md-comp-top-app-bar-medium' as md-comp-top-app-bar-medium-*;
+@forward './md-comp-top-app-bar-small' as md-comp-top-app-bar-small-*;
+@forward './md-comp-top-app-bar-small-centered' as md-comp-top-app-bar-small-centered-*;
 @forward './md-ref-palette' as md-ref-palette-*;
 @forward './md-ref-typeface' as md-ref-typeface-*;
 @forward './md-sys-color' as md-sys-color-*;