Merge branch '21.0.x' into rivanova/tooltip-arrow-16572-21.0.x

Author: RivaIvanova

projects/igniteui-angular/src/public_api.ts

@@ -34,7 +34,6 @@ export * from 'igniteui-angular/button-group';
 export * from 'igniteui-angular/calendar';
 export * from 'igniteui-angular/card';
 export * from 'igniteui-angular/carousel';
-export * from 'igniteui-angular/chat';
 export * from 'igniteui-angular/checkbox';
 export * from 'igniteui-angular/chips';
 export * from 'igniteui-angular/combo';