a11y: va-rating

[kushich]

• step 1: investigate a11y guides for this component;
• step 2: discuss with team;
• step 3: implement required functionality;
• step 4: add docs page section about a11y.



[kushich]

Keyboard navigation (ref)

When I use	I see/hear
Tab	Focus visibly moves to the checked radio button in the group. If a radio button is not checked, focus moves to the first radio button in the group.
Spacebar	If the radio button with focus is not checked, changes the state to checked. Otherwise, does nothing.
Arrows	Moves focus to and checks the previous or next radio button in the group (if we focused on the last/first element, the next focus move should be on the first/last element (loop))

Semantics

VaRatingItem should be a radio input element as this is a choice between ratings.

[asvae]

For spacebar we have uncheck behavior for clearable.