Add event emitted for scrolling action

[gusnaughton]

Alaska Airlines Pull Request

For placements that rely on actions in the light DOM based on carousel action, an event is emitted from the component.

Type of change:

Please delete options that are not relevant.

• [x] New capability

Checklist:

• [x] My update follows the CONTRIBUTING guidelines of this project
• [x] I have performed a self-review of my own update

By submitting this Pull Request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

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:tada: This PR is included in version 1.2.0 :tada:

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