refactor: use `KeyboardAnimation` as common interface for an animation driver

📜 Description

Added KeyboardAnimation class (as common interface) which drives an animation of the keyboard.

💡 Motivation and Context

Follow up for https://github.com/kirillzyusko/react-native-keyboard-controller/pull/412

Keyboard animation can be driven not only by CASpringAnimation class. What we want to achieve is to have a single interface that gives us all necessary properties (value for a particular timing, etc.), but will incapsulate calculations of these values internally.

So in this PR I added KeyboardAnimation abstract class that uses some common properties for all animations (from/to value, speed, init time), has universal method for finding a particular timing for a given value (since we use a binary search) and defines other publicly available functions.

And in this PR I also started to use this universal interface (KeyboardAnimation) in KeyboardMovementObserver (SpringAnimation inherits from KeyboardAnimation).

📢 Changelog

iOS

added KeyboardAnimation class and KeyboardAnimationProtocol;
moved all shared logic in KeyboardAnimation class;
started to use KeyboardAnimation as a common interface for animation.

🤔 How Has This Been Tested?

Tested on iPhone 11 (iOS 17.4), real device.

📸 Screenshots (if appropriate):

No visual changes.

📝 Checklist

[x] CI successfully passed
[x] I added new mocks and corresponding unit-tests if library API was changed

kirillzyusko / react-native-keyboard-controller