Draft: feat(DesignTokens): init Figma API sync

What does this MR do?

• Add sync to and from Figma scripts for design tokens
• Add Figma extension properties to design tokens

Validating locally

1. Create a .env file in the root of the project with FIGMA_ACCESS_TOKEN and FIGMA_FILE_KEY values e.g.

   FIGMA_ACCESS_TOKEN=example-figma-access-token-123
   FIGMA_FILE_KEY=example-figma-file-id

2. Run yarn tokens:sync-to-figma to push JSON tokens to Figma file
3. Run yarn tokens:sync-from-figma to import JSON tokens from Figma file

Screenshots or screen recordings

Integration merge requests

• GitLab: mr_url
• CustomersDot: mr_url
• Status Page: mr_url

Does this MR meet the acceptance criteria?

This checklist encourages the authors, reviewers, and maintainers of merge requests (MRs) to confirm changes were analyzed for conformity with the project's guidelines, security and accessibility.

Toggle the acceptance checklist

Conformity

• Code review guidelines.
• GitLab UI's contributing guidelines.
• If it changes a Pajamas-compliant component's look & feel, the MR has been reviewed by a UX designer.
• If it changes GitLab UI's documentation guidelines, the MR has been reviewed by a Technical Writer.
• If the MR changes a component's API, integration MR(s) have been opened (see integration merge requests above).
• Added the ~"component:*" label(s) if applicable.

Security

If this MR contains changes to processing or storing of credentials or tokens, authorization and authentication methods and other items described in the security review guidelines:

• Label as security and @ mention @gitlab-com/gl-security/appsec
• Security reports checked/validated by a reviewer from the AppSec team

Accessibility

If this MR adds or modifies a component, take a few moments to review the following:

• All actions and functionality can be done with a keyboard.
• Links, buttons, and controls have a visible focus state.
• All content is presented in text or with a text equivalent. For example, alt text for SVG, or aria-label for icons that have meaning or perform actions.
• Changes in a component’s state are announced by a screen reader. For example, changing aria-expanded="false" to aria-expanded="true" when an accordion is expanded.
• Color combinations have sufficient contrast.

Closes #2460 (closed)