fix(typings): fix AnimatableComponent ref type and animate method return signature (#407, #328)

[hmadhsan]

Closes #407
Closes #328

🐛 What was the issue?

1. Ref Type Error (Incorrect ref type #407): AnimatableComponent in typings/react-native-animatable.d.ts extended ClassicComponentClass (a React constructor class type) alongside Component. When developers passed Animatable.View or Animatable.Text to useRef<Animatable.View>(null), TypeScript treated the ref type as a constructor class instead of a component instance.
2. Animate Method Signature (Add .animate() method to typings #328): The .animate() method signature was declared as returning Promise<void>, whereas createAnimatableComponent.js at runtime returns Promise<{ finished: boolean }>.

🛠️ What did we fix?

• TypeScript Inheritance: Replaced extends Component, ClassicComponentClass<AnimatableProps<S> & P> with extends Component<AnimatableProps<S> & P, S> in typings/react-native-animatable.d.ts.
• Animate Method Return Signature: Updated .animate(...) method signature to return Promise<{ finished: boolean }>.

🧪 Testing & Verification

• Verified that component refs (e.g. useRef<Animatable.View>(null)) resolve cleanly to component instance types with access to instance methods (.slideInDown(), .animate(), etc.).
• Verified alignment between typings/react-native-animatable.d.ts declarations and createAnimatableComponent.js runtime return values.