fix(lib.dom.d.ts): Keyframe interface supports CSS Typed OM objects

Allow CSSStyleValue (and its subtypes like CSSTransformValue, CSSImageValue,
CSSNumericValue, etc.) in the Keyframe, ComputedKeyframe, and
PropertyIndexedKeyframes index signatures.

This enables using CSS Typed OM objects in Web Animations API keyframes,
for example:
  element.animate([
    { transform: 'rotate(0deg)' },
    { transform: new CSSRotate(45, 0, 0, CSSNumericValue.parse('90deg')) }
  ], { duration: 500 })

Fixes #63325

Author: D2758695161