Expose the default module resolver in a package

Currently we can access the default `resolver` when in a `--loader` loader. However we can't access this loader from a regular program. I'd like to propose exposing this function as a regular function that can be imported at runtime for use with `vm.SourceTextModule` to create in-process loaders. For example: ```js import vm from 'vm'; import process from 'process'; import url from 'url'; import { resolver } from 'module'; const cwd = url.pathToFileURL(process.cwd() + '/'); class TestLoader { #cache = new Map(); #realm = vm.createContext({}); async #loadModule(url) { return new vm.SourceTextModule(await fsp.readFile(resolvedUrl, 'utf8'), { url: resolvedUrl, context: this.#realm, }); } async #linker(module, specifier) { // --- Use node's resolution algorithm --- const resolvedUrl = resolver(module.url, specifier); if (this.#cache.has(resolvedUrl)) { return this.#cache.get(resolvedUrl); } const module = this.#loadModule(resolvedUrl); this.#cache.set(resolvedUrl, module); return module; } constructor() { // Setup test environment this.#realm.evaluate(`function deepEqual(a, b) { /* ... */ }`); } async runTest(file) { const module = this.#loadModule(resolver(cwd, file)); await module.link((...args) => this.#linker(...args)); module.instantiate(); try { await module.evaluate(); return { passed: true }; } catch (error) { return { passed: false, error }; } } } ```