docs: add api guidelines doc

[joshblack]

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size-limit report 📦

Path	Size
packages/react/dist/browser.esm.js	105.38 KB (0%)
packages/react/dist/browser.umd.js	105.74 KB (0%)

[joshblack]

Couple of ideas:

• Prefer interface to type to avoid never from intersections

  type A = { value: number };
  type B = A & { value: string };
  // B['value'] == never
  
  interface C { value: number }
  interface D extends C { value: string } // <- Types of property 'value' are incompatible

• Prefer React.HTMLAttributes<HTMLElement> over React.ComponentPropsWithoutRef unless element type is a part of public API

  • Allows generic spread on outermost element so that you can change element type over time