refactor(progress-bar): refactor progress bars initial commit (#15231)

Author: desig9stein

projects/igniteui-angular/src/lib/core/styles/components/_index.scss

@@ -35,7 +35,8 @@
 @forward 'navdrawer/navdrawer-theme';
 @forward 'overlay/overlay-theme';
 @forward 'paginator/paginator-theme';
-@forward 'progress/progress-theme';
+@forward 'progress/linear/linear-theme';
+@forward 'progress/circular/circular-theme';
 @forward 'radio/radio-theme';
 @forward 'ripple/ripple-theme';
 @forward 'query-builder/query-builder-theme';