Add useData: false option to allow custom template engines to opt-out of Data Cascade for templates

[zachleat]

Example:

const sass = require("sass");

module.exports = function (eleventyConfig) {
	eleventyConfig.addExtension("scss", {
		outputFileExtension: "css",
		useLayouts: false,
		useData: false,

		// `compile` is called once per .scss file in the input directory
		compile: async function (inputContent) {
			let result = sass.compileString(inputContent);
			return async (data) => {
				// Since useData is false, data will be undefined here
				return result.css;
			};
		},
	});
};

Take note also of the existing getData option to add additional data to the data cascade.

https://www.11ty.dev/docs/languages/custom/#getdata-and-getinstancefrominputpath

[zachleat]

Related #2830

[zachleat]

By default this repo closes enhancement request issues and places them in a queue for folks to upvote. We do this to avoid a large build-up of open issues. We got this idea from the lodash project.

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