Part of: #40318

This is a tracking issue to detail efforts towards implementing a subset of the section-specific theme.json functionality.

Todo

• Add further element color options to container blocks e.g. buttons & headings
  • Design Tools: Add block instance elements color support for buttons and headings #53667
  • Draft PR above explores implementing button and heading element colors by following how link colors work.
• Allow elements within container blocks to also have typographic styles applied
• Explore implementing mechanism to generate per block-type styles scoped by container block instance
• Investigate how we allow defining block type styles for a section i.e. through the UI
  • Is a whole UI required e.g. the "Blocks" screen in Global Styles?