IgniteUI / igniteui-webcomponents / 32716381877

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fix(carousel, rating): repair autoplay lifecycle, value precision and ARIA (#2350)

* fix(carousel, rating): repair autoplay lifecycle, value precision and ARIA

Carousel: stop the rotation timer on disconnect and start it again on
reconnect, keep the playing and paused states consistent through interval
changes, drop the timer that stayed behind at the `disableLoop` end stop,
and start the rotation again only after a pause that an interaction caused.
Map projected indicators to the slides by position in either direction,
move the active state when the active slide leaves the DOM, and set
`aria-controls` on each indicator instead of the host.

Rating: normalize the value once in its setter, thus `aria-valuenow`,
`aria-valuetext` and the `igcChange` payload agree. `stepUp(n)` and
`stepDown(n)` move by `n` steps. A non-numeric `max` or `step` falls back
to a valid number. The slider takes its name from the host `aria-label`
without a `label`, and exposes `aria-readonly` and `aria-disabled`.

Guard the gestures controller against a host that disconnects before its
first render completes, which the carousel could trigger.

Adds 24 tests. No existing test changed.

7052 of 7375 branches covered (95.62%)

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262 of 267 new or added lines in 3 files covered. (98.13%)

49326 of 49873 relevant lines covered (98.9%)

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