Import plugins without creating the global instance

[DmitrySharabin]

Each plugin adds itself to the registry from #4168 instead of importing global.js. Importing a plugin no longer creates the global instance, and plugins apply in any import order.

<!-- Modules, in any order: Prism comes third here -->
<script type="importmap">
	{ "imports": { "prismjs": "./dist/index.js", "prismjs/": "./dist/" } }
</script>
<script type="module">
	import "prismjs/plugins/line-numbers.js";
	import "prismjs/languages/css.js";
	import "prismjs";
	import "prismjs/languages/javascript.js";
	import "prismjs/plugins/highlight-keywords.js";
</script>

<!-- Classic script: the build loads the plugins from the page settings, or from data-plugins="line-numbers,highlight-keywords" -->
<script>
	window.Prism = { plugins: ["line-numbers", "highlight-keywords"] };
</script>
<script src="dist/prism.js"></script>

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