chore: Create a story for AnimatedSpinner component

[devin-ai-integration[bot]]

Description

This PR adds a Storybook story for the AnimatedSpinner component located in the metamask-mobile/app/components/UI/AnimatedSpinner directory. The story includes a default export with the necessary properties and a single default story for the component. The story file has been verified for correct import paths and linting errors.

Link to Devin run: https://preview.devin.ai/devin/b26cb50e0e094a50a39b2727fbc6bb7a

Requested by: Devin

Related issues

Manual testing steps

3. Go to the latest build of storybook in this PR
4. Navigate to the <componentName> component in the Components/ folder.

Screenshots/Recordings

Pre-merge author checklist

• [X] I’ve followed MetaMask Coding Standards.
• [X] I've completed the PR template to the best of my ability
• [X] I’ve included tests if applicable
• [X] I’ve documented my code using JSDoc format if applicable
• [X] I’ve applied the right labels on the PR (see labeling guidelines). Not required for external contributors.

Pre-merge reviewer checklist

• [ ] I've manually tested the PR (e.g. pull and build branch, run the app, test code being changed).
• [ ] I confirm that this PR addresses all acceptance criteria described in the ticket it closes and includes the necessary testing evidence such as recordings and or screenshots.