Adopt importmaps in WebGPU examples

[mrdoob]

Related issue: #20455 (comment)

Description

Next week's Chrome 89 release will ship with import maps and Mozilla has shown positive interest.
The current bundle-less dev experience using modules is broken without them so the sooner we adopt the better.

We'll start by using them in the WebGPU examples.

[mrdoob]

/fyi @sunag

[sunag]

Wow... It is great, always been a headache to count the folder hierarchy. The first thing I thought was <script type="importmap" src="./threemaps/three.json"></script> but it seems there yet it still no support. I will do the same thing with the nodes.

[sunag]

It makes me wonder if we should already adopt private field for WebGPU?

class PrivatePropertyTest { 

	#str = "hello world";
	
	constructor() {
	
		console.log( this.#str ); // hello world
	
	}
	
} 

let test = new PrivatePropertyTest();
console.log( test.#str ); // error

[Mugen87]

The introduction of import maps was the result of some sort of emergency. I think I would wait with adopting other language features (like private class fields) until they are better supported.