FR: tree shake JSON imports

[Conaclos]

As indicated in the ESBuild documentation, ESbuild is able to tree shake a JSON import when we use named imports.
Unfortunately, named imports for JSON files are now an outdated feature in JS engines.
A JSON file must now be imported as a default import and with an import attribute.

ESbuild could recognize standard JSON imports and tree shake them.

Given the following code:

import packageJson from "./package.json" with { type: "json" };
export const VERSION = packageJson.version;

And assuming that version is set to 1.0.0 in package.json, ESbuild could output the following bundled code:

export const VERSION = "1.0.0";