Allow swipe to custom angles

[HeySreelal]

Description

Added feature to swipe to custom angles.

Changes

So far the CardSwiperDirection was an enum and only had values left, right, top, bottom and none - which works pretty fine, but leaves the user with only limited choices to swipe with the controller.

1. CardSwiperDirection was changed to a class containing an angle property.
2. All cardinal directions (left, right, top, and bottom) are predefined as static getters. Hence, this won't be a breaking change.
3. Added methods animateToAngle and animateUndoFromAngle inside the CardAnimation class to animate the card to any given angle.
4. Since, CardAnimation.animateToAngle, CardAnimation.animateUndoFromAngle can now animate and undo animation to any given angle, we don't need previous implementations such as animateHorizontally, animateVertically, animateUndoHorizontally, and animateUndoVertically, hence these are removed.
5. Since different parts of the library depended on CardSwiperDirection from src/enums.dart had to change the imports here and there.

Related Issues

• Closes Controller swipeLeft/Right angle #30

Pre-launch Checklist

• I read the Contributor Guide and followed the process outlined there for submitting PRs.
• I updated pubspec.yaml with an appropriate new version according to the pub versioning philosophy, or this PR is exempt from version changes.
• I updated CHANGELOG.md to add a description of the change, following repository CHANGELOG style.
• I updated/added relevant documentation (doc comments with ///).
• All existing and new tests are passing.

Visual Reference & Code

FloatingActionButton(
  onPressed: () {
    final dir = CardSwiperDirection.custom(290);
    controller.swipe(dir);
  },
  child: const Icon(Icons.keyboard_arrow_left),
),
FloatingActionButton(
  onPressed: () {
    final dir = CardSwiperDirection.custom(60);
    controller.swipe(dir);
  },
  child: const Icon(Icons.keyboard_arrow_right),
),

Screen.Recording.2024-10-06.at.1.21.26.PM.mov

[ricardodalarme]

Wow, what a great change! I really appreciate that. I've just merged your changes. Thank you so much for your contribution!

[HeySreelal]

Yay! I'm so happy to be part of this library! 🦄

[HeySreelal]

I'm not sure why - the #30 is not closed yet, I think it can be closed as this PR is merged now :)

Also, if you may please let me know your thoughts on #47 - I already have the changes ready - I'm a little bit confused about it - whether we actually need it or not :)

Thankss again!