TypeScript: SpringProps doesn't inherit from SpringBaseProps

[bhollis]

SpringProps (which is used from Spring) doesn't inherit from SpringBaseProps, and thus doesn't include properties like native.

Code: https://github.com/react-spring/react-spring/blob/master/types/universal.d.ts#L67

[vpicone]

Now that this is set up, components that allow spring props (Trail, Keyframes and Transition) should extend SpringProps. As it is now, these components can't use props that aren't SpringBaseProps (after, etc.). I'll open a PR for Trail since it's rather simple, not sure how the others should be handled.

[aleclarson]

Fixed by e622f17