chore: resolve TODO for reusing of TransitionConfig

But also provide the possibility to override the props and also keeps
the namespace to provide breaking changes.

src/runtime/animate/index.ts

@@ -1,14 +1,8 @@
 import { cubicOut } from 'svelte/easing';
 import { is_function } from 'svelte/internal';
+import { TransitionConfig } from 'svelte/transition';
 
-// todo: same as Transition, should it be shared?
+export interface AnimationConfig extends TransitionConfig {}
-export interface AnimationConfig {
-	delay?: number;
-	duration?: number;
-	easing?: (t: number) => number;
-	css?: (t: number, u: number) => string;
-	tick?: (t: number, u: number) => void;
-}
 
 interface FlipParams {
 	delay: number;