feat: Implement Sprite Tint

[eonarheim]

===:clipboard: PR Checklist :clipboard:===

• 📌 issue exists in github for these changes
• 🔬 existing tests still pass
• 🙈 code conforms to the style guide
• 📐 new tests written and passing / old tests updated with new scenario(s)
• 📄 changelog entry added (or not needed)

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This PR adds the ability to tint sprites by a color.

const imageSource = new ex.ImageSource('./path/to/image.png');
await imageSource.load();
const sprite = imageSource.toSprite();
sprite.tint = ex.Color.Green;

In this example the blocks are tinted green

Changes:

• Add tint property to ex.Sprite
• Updates graphics context and image renderer to support the tint