[feat]: Interpolate with a delay

A clear and concise description of what the feature is

When using SpringValue interpolations, we should be able to interpolate with a delay.

Why should this feature be included?

For complex animations with multiple components and values being animated together, it's nice to be able to hook them all to one driving spring. It can be very difficult to use the existing interpolation API to stage animations, especially when they are asymmetrical (want a delay on animation in, no delay on animation out).

Please provide an example for how this would work

import {delay} from 'react-spring'

const spring = useSpring({ x: isActive ? 1 : 0})

// component with delay
<animated.div style={{opacity: spring.x.to(x => delay(x, 200))}} />

// component without delay
<animated.div style={{opacity: spring.x}} />

// component with existing api
<animated.div style={{opacity: spring.x.to([0, 0.5, 1), [0, 1, 1])}} />

No files or tests are named in the issue. Start by locating the SpringValue interpolation API and reviewing the delay example; define the behavior for delayed interpolation, including asymmetric animation delays, then add coverage showing delayed and non-delayed values behave as described.