Add zoom-to-point methods for OrthographicCamera

[AristurtleDev]

Description

This pull request adds zoom-to-point functionality to OrthographicCamera, allowing developers to zoom toward a specific world position while keeping that point fixed on screen.

Related Issues/Tickets

• Closes New Zoom functions for the Camera class #625

Changes Made

OrthographicCamera.cs

• Added ZoomIn(float deltaZoom, Vector2 zoomCenter) method that zooms in while keeping a world position fixed on screen
• Added ZoomOut(float deltaZoom, Vector2 zoomCenter) method that zooms out while keeping a world position fixed on screen
• Both methods include position adjustment formula: Position += (zoomCenter - Origin - Position) * ((newZoom - oldZoom) / newZoom)
• Position adjustment is skipped when zoom is clamped by MinimumZoom, MaximumZoom, or world bounds to prevent unexpected camera movement

Checklist

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• I have verified that there are no existing pull requests that would overlap with this pull request.
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• I have written a descriptive title for this pull request.
• I have provided appropriate test coverage were applicable.