feat: add example and guide for three + pixi

[GoodBoyDigital]

Really trying to get into a habit of creating guides along with new features! So here is a guide for mixing three and pixi in the same context!

dependant on pixijs/pixijs#11142

@Zyie - will leave the dependancy bit with you!

[Copilot]

Copilot reviewed 5 out of 6 changed files in this pull request and generated 2 suggestions.

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• src/examples/v8.0.0/examplesData.json: Language not supported

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docs/guides/advanced/mixing-three-and-pixi.md:6

• The word 'Lets' should be 'Let's' in the sentence 'Lets see how to do this.'

Combining the advanced 3D rendering capabilities of Three.js with the speed and versatility of PixiJS for 2D can result in a powerful, seamless experience. Lets see how to do this.

[Copilot]

The method 'roundRect' should be 'drawRoundedRect' in PixiJS.

Suggested change

	const uiLayer = new Graphics().roundRect(20, 80, 300, 300, 20).fill(0xffff00);
	const uiLayer = new Graphics().drawRoundedRect(20, 80, 300, 300, 20).fill(0xffff00);

[Copilot]

The 'Text' constructor is called incorrectly. It should be 'new Text('Pixi and Three.js', { fontFamily: 'Arial', fontSize: 24, fill: 'black' })'.

Suggested change

	const text = new Text({ text: 'Pixi and Three.js', style: { fontFamily: 'Arial', fontSize: 24, fill: 'black' } });
	const text = new Text('Pixi and Three.js', { fontFamily: 'Arial', fontSize: 24, fill: 'black' });