Jaws announcements not working - ARIA role should be Slider instead of Separator

**Describe the bug**
When Jaws is ON and I focus on gutter and press arrow keys - Left/Right or Up/Down gutter not getting resized it remains in same position

Suggestion -

Using Slider role on gutter instead of Separator works

Related issues - https://github.com/angular-split/angular-split/issues/349
