feat: in-context editable blocks

[buuhuu]

This adds support for fully instrumented blocks for in-context editing.

• instrumentation preserved when wrapping non-block content in cells into a <p> or <pre>
• buttons consistently decorated in blocks
• instrumentation preserved in cards.js

[aem-code-sync]

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Commits

• c723332 ✅ (latest)
• 7e8ce33 ✅
• c181ce0 ✅
• 4c682dc ✅
• 99b014b ✅
• 44c2e34 ✅
• 48ebba9 ❌