test_runner: introduces a new MockTimers API

This PR introduces a new FakeTimers API for the native Node.js test runner.

I'm opening it for review as I've implemented all features for this initial version (it's still missing docs but I think we can start moving forward while I write them)

Backlog

• - accept a list of "Which timers/things do I mock?"
• - add an experimental warning
• - tests
• - 100% code coverage
• - docs
• - be part of the mock module
• - works with globals
• - works with require("timers/promises")
• - works with require("timers")
• - have a .reset function to clear the state
• - have a .releaseAllTimers function to trigger all functions
• - .reset calls itself after an .it test

API:

• - globals
  • - setTimeout
  • - clearTimeout
  • - setInterval
  • - clearInterval
• - timers
  • - setTimeout
  • - clearTimeout
  • - setInterval
  • - clearInterval
• - timers/promises
  • - setTimeout
  • - setInterval

For the next version:

• - Date.now
• - performance.now
• - scheduler.wait
• - queueMicrotask/process.nextTick
• - add tests for edge cases

MockTimers Design API

MockTimers.enable(['setInterval', 'setTimeout' ]) // enable fake timers
MockTimers.reset()  // clean up to the original state
MockTimers.tick(100) // advance in time by 100ms
MockTimers.runAll() // release all timers

Usage example:

import assert from 'node:assert';
import { test } from 'node:test';

test('mocks setTimeout to be executed synchronously without having to actually wait for it', (context) => {
  const fn = context.mock.fn();
  context.mock.timers.enable(['setTimeout']);
  const nineSecs = 9000;
  setTimeout(fn, nineSecs);

  const threeSeconds = 3000;
  context.mock.timers.tick(threeSeconds);
  context.mock.timers.tick(threeSeconds);
  context.mock.timers.tick(threeSeconds);

  assert.strictEqual(fn.mock.callCount(), 1);
});