Add Arkanoid Example Game

[OtowoSamuel]

Closes #15

Description

This PR adds a comprehensive implementation of the Arkanoid game to the examples/ directory to demonstrate the capabilities of the Cougr-Core ECS framework on Soroban. The implementation serves as a functional reference for building complex on-chain game logic with persistent state and component-based architecture.

Changes

• New Example: Added examples/arkanoid with full project structure.
• Game Logic: Implemented core mechanics including:
  • PaddleComponent: Player controlled paddle with bounds checking.
  • BallComponent: Physics-based ball movement and collision.
  • BricksComponent: Grid of breakable bricks using optimized storage.
  • ScoreComponent: Tracking score, lives, and game state.
• Systems: Implemented ECS systems for Physics, Collision, and Scoring.
• Testing: Added comprehensive unit test suite covering initialization, movement, collisions, and win/loss conditions.
• CI/CD: Added GitHub Actions workflow (arkanoid.yml) for automated testing and building.
• Documentation: Provided detailed README with setup, deployment, and usage instructions.

Technical Details

• Uses cougr-core ECS pattern for modularity.
• Implements custom BricksComponent using soroban_sdk::Vec for compatibility with Soroban storage (replacing unsupported large fixed arrays).
• Handles complex collision logic for walls, paddle, and bricks within a deterministic tick update function.
• Optimizes storage access by bundling state updates.

Verification

• Tests: All 17 unit tests passed locally.
• Build: Compiles successfully for wasm32-unknown-unknown and wasm32v1-none targets.
• Linting: Code is formatted and passes cargo clippy.

Checklist

• Code compiles without warnings
• All tests pass
• Documentation updated
• CI workflow added

[OtowoSamuel]

@salazarsebas please review my PR

[salazarsebas]

Hey @OtowoSamuel , please fix the workflow errors

[OtowoSamuel]

Okay, On it. @salazarsebas

[OtowoSamuel]

@salazarsebas Please review it