Move and extract various logic into reusable pieces that we can share with other areas of Tokens Studio

[six7]

Removing file complexity, related to #2944

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1. RC Mentions: decouple logic and UI. Firstly in the plugin monorepo, then move to the DS #2998
   dev experience +1
2. Variable creation #2999
   Figma variables dev experience +2
3. Sync providers: extract into its own folder #3000
   0 of 9
   dev experience sync indicators +2
   
4. Group RegEx / String-based hooks #3001
   dev experience +1
5. Create figma-common-utils to contain shared logic with Figma interactions #3002
   dev experience +1
6. Sync providers: refactor reusable logic #3012
   dev experience sync indicators +2
   
7. Token resolving -> Style Dictionary
8. Sync providers: create a simple storybook proof of concept of a button that pushes variables to X sync providers #3091
   dev experience sync indicators +2