Recommend `node`/`default` conditions instead of `require`/`import` as a solution to the dual package hazard

### Affected URL(s) https://nodejs.org/api/packages.html#dual-package-hazard ### Description of the problem Publishing packages with dual CommonJS and ESM sources, while has the benefits of supporting both CJS consumers and ESM-only platforms, is known to cause problems because Node.js might load both versions. Example: <table><tr> <th><code>package.json</code></th> <th><code>foo.cjs</code></th> <th><code>foo.mjs</code></th> </tr> <tr><td> ```json { "name": "foo", "exports": { "require": "./foo.cjs", "import": "./foo.mjs" } } ``` </td><td> ```js exports.object = {}; ``` </td><td> ```js export const object = {}; ``` </td></tr></table> <table><tr> <th><code>package.json</code></th> <th><code>bar.js</code></th> </tr> <tr><td> ```json { "name": "bar", "main": "./bar.js" } ``` </td><td> ```js const foo = require("foo"); exports.object = foo.object; ``` </td></tr></table> ```js // my app import { object as fooObj } from "foo"; import { object as barObj } from "bar"; console.log(fooObj === barObj); // false????? ``` The two suggested solutions boil down to "even when you have an ESM entrypoint, still use only CJS internallly". This solves the dual package hazard, but completely defeats the cross-platform benefits of dual modules. If `foo` instead used these export conditions: ```json { "name": "foo", "exports": { "node": "./foo.cjs", "default": "./foo.mjs" } } ``` Then: - there would be no dual-package hazard in Node.js, because it only ever loads the CommonJS version - there would be no dual-package hazard in bundlers, because they would only ever load either the `node` version (if they are configured to target Node.js) or the `default` version (if they are configured to target other platforms). - the package solves the dual-package hazard while still providing an ESM-only version We have been using this `node/default` pattern in `@babel/runtime` for a couple years, because we wanted to provide an ESM-only version for browser…