### Description Implement "karaoke", "popout" and "rainbow" presets for amp-story-captions with the following spec: <img width="600" alt="Screen Shot 2022-04-12 at 1 54 35 PM" src="https://user-images.githubusercontent.com/3860311/163033467-c59bfda7-1adc-49fc-9382-34ad77f5cc43.png"> "appear" preset was implemented in #37967 This will be a follow up to #37900.
