option to disable smooth scrolling in carousel

### Description

Carousels should expose the [smoothScroll parameter](https://github.com/ampproject/amphtml/blob/c3940a0a90663270e8c244d0e82fb3d67958ad34/extensions/amp-base-carousel/0.1/carousel.js#L468C3-L468C12) in the constructor, so that developers who want to disable smooth scrolling transitions between slides can do so.

### Alternatives Considered

There are no viable alternatives, as the CSS 'scroll-behavior' is not allowed in AMP emails.

### Additional Context

_No response_

Start in extensions/amp-base-carousel/0.1/carousel.js at the constructor and the linked smoothScroll parameter. Trace how carousel instances receive options and how slide transitions use that setting. Done means developers can disable smooth scrolling through the constructor, including for AMP emails where CSS scroll-behavior is unavailable.

Written by the indexing model from the issue text.