feat(ui5-carousel): Implement F7 keyboard functionality

[TeodorTaushanov]

Part of #3092

[georgimkv]

On http://localhost:8080/test-resources/pages/Carousel.html
If the focus is on a list item within a card, pressing F7 twice will not restore the focus to the same item.
_onfocusin in the Carousel does not get called every time - in particular, when the focus moves from the card header to the list in the card.

Can you also write a test?

[TeodorTaushanov]

On http://localhost:8080/test-resources/pages/Carousel.html
If the focus is on a list item within a card, pressing F7 twice will not restore the focus to the same item.
_onfocusin in the Carousel does not get called every time - in particular, when the focus moves from the card header to the list in the card.

Can you also write a test?

Tests are added.

The ui5-list stops propagation of the "focusin" event. For that F7 keyboard navigation doesn't work for it. This should be fixed in the ui5-list.

Done.

[CLAassistant]

All committers have signed the CLA.

[ilhan007]

+1, someone from @SAP/ui5-webcomponents-topic-rd should also review the change

[ilhan007]

If this was the last change related to the Keyboard Handling epic, you can close the issue
#3092