Fix transforms in clip() by using shape system for primitives using manual method

[VANSH3104]

Resolves #7903

Changes:

Modified ellipse() method in p5.Renderer2D to apply transforms during clipping
Used existing this.initialClipTransform (inverse of initial transform) stored in beginClip()
Applied correct matrix multiplication order: initialClipTransform.multiply(currentTransform)

Screenshots of the change:

PR Checklist

• npm run lint passes
• Inline reference is included / updated
• Unit tests are included / updated

[VANSH3104]

@davepagurek I've implemented the manual fix for the ellipse() method and it's working correctly now!
I think moving to the class-based approach you suggested would be better long-term. Should I extend this manual fix to other primitives (rect, arc, etc.) first, or start working on migrating them to the shape system? and also drawshape function is useless i think its never call while clipping on or off