IgniteUI / igniteui-webcomponents / 32238921693

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fix(button-group): repair selection identity, disabled inheritance and ARIA (#2342)

Selection was keyed by `value`, so buttons without one - or sharing one -
compared equal and the selection could never move.

- `selectedItems` now replaces the previous selection instead of adding to it,
  takes effect synchronously, and reports buttons with an empty `value`.
- A disabled group no longer overwrites its buttons' `disabled` property: the
  state is inherited, so a button disabled in its own right stays disabled and
  buttons added to a disabled group are disabled as well.
- `focus()`, `blur()` and `click()` no longer throw before the first render.
- Toggle buttons that are not direct children no longer affect the selection.
- The single selection modes expose `radiogroup`/`radio` semantics instead of
  `aria-pressed`, and the `focused` CSS part is documented.

Closes #2229.

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