feat(@dpc-sdp/ripple-ui-shared): adds styles and contracts packages for multi framework support

[dylankelly]

Issue:

What I did

• Introduced a new shared styles package and shared contracts package to support multi-framework UI delivery.
• Refactored style token generation to use W3C Design token standard using Cobalt UI
• Moved component prop types to ripple-ui-shared package so they can be used in different frameworks eg: React, Vue, Webcomponents can all share the same props definitions.

How to test

• See follow up PRs for React and vue library usage

Checklist

For all PR's

• I've added relevant changes to the project Readme if needed
• I've updated the documentation site as needed
• I have added tests to cover my changes (if not applicable, please state why in a comment)

For new UI components only

• I have added a storybook story covering all variants
• I have checked a11y tab in storybook passes
• I have added cypress component tests (if the component is interactive)
• Any events are emitted on the event bus using emitRplEvent