chore(menu): update to SHINE styles

[dancormier]

SPARK-71

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This PR updates the Menu component to match updated SHINE styles (Figma) and adds a Svelte version of the component.

For the Svelte component, I made the choice to go with child components much like we do with PostSummary. I'm not 100% on this approach and would appreciate any thoughts/opinions here.

How to test

• View the component and verify it renders as expected
  • Please read the docs and provide feedback
• Go to the Svelte component and verify it renders as expected
• Run tests and verify they pass (excluding visual tests which will be updated before merge)

TODO before merge

• Verify docs are reasonably updated
• Regenerate visual regression test images

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Latest commit: 27e1da8

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[giamir]

Great work @dancormier. I have left few comments and suggestions.

The examples for this component show radio group versions as well as a selected state. Both of these are subject to change after this PR is merged and once work is done on the radio component (SPARK-77).

Do we have a follow up ticket for updating the Menu component once Radio and Checkbox have been implemented?
Crazy thought, should we leave the MenuItemControl Svelte subcomponent out of scope for this PR since it will reuse Radio and Checkbox (do the work as part of the follow up ticket)?

[giamir]

Great work @dancormier. ❤️
I only had a small clarifying comment. Apart from that I think we should be good to merge. Thank you.

[giamir]

Have you tried the mask approach I used in the navigation PR?
https://github.com/StackExchange/Stacks/pull/2043/files#diff-845a558e834104583bf3479fcdc5df7efdf518047bc7e75275acb2f99692311c