[5.3] Update What's New Modal

[Cal-L]

Description

Update What's New Modal to use templating system

Technical Details

• Update WhatsNewModal/index.js to parse and render data from whatsNewList.js
• Update whatsNewList.js with template system

- Slides utilizes a templating system in the form of a 2D array, which is eventually rendered within app/components/UI/WhatsNewModal/index.js.
- The root layer determines the number of slides. Ex. To display 3 slides, the root layer should contain 3 arrays.
- The inner layer determines the content that will be rendered within each slide.
- The slide content takes the form of union types, where the possible types are `image`, `title`, `description`, or `button`.
- Both slide count and slide content will be rendered in the same order as the data set.

Acceptance Criteria

• Template system should support any number of slides
• It should also support any order of the union types

References

• Figma example of what these changes should support - https://www.figma.com/file/2h15YfvbT2q4q1FOMJFPP1/Token-Detection-V2?node-id=12%3A3663

[wachunei]

typescript? 👀

[Cal-L]

Included in #4484