Add a copy constructor and Clone method to the Sprite class

[AristurtleDev]

Description

Implements a copy constructor and Clone() method to enable creating copies of Sprite instances without mutating the original. This addresses the use case of needing multiple sprite instances with different properties (such as SpriteEffects) that share the same texture region.

The implementation performs a shallow copy where the new sprite shares the same TextureRegion reference but has independent copies of all other properties. The Clone() method delegates to the copy constructor.

Related Issues/Tickets

• Closes [Feature Request]: Implement ICloneable interface for Sprite #1028

Changes Made

• Added Sprite(Sprite) copy constructor
• Added Sprite.Cone() method

Checklist

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