fix(vite-node): coerce to string in import(dep)

[jcbhmr]

This PR would...

• Coerce dep to string using the string coercion algorithm in import(dep)

Need to use `${s}` instead of "" + s in order to get the right hint in Symbol.toPrimitive

const obj2 = {
  [Symbol.toPrimitive](hint) {
    if (hint === "number") {
      return 10;
    }
    if (hint === "string") {
      return "hello";
    }
    return true;
  },
};
console.log(+obj2); // 10        — hint is "number"
console.log(`${obj2}`); // "hello"   — hint is "string"
console.log(obj2 + ""); // "true"    — hint is "default"

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Symbol/toPrimitive#description

closes #3429

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[sheremet-va]

Can you add a test case for this, please?

[jcbhmr]

Added a test case:

test('dynamic import coerces to string', async () => {
  const dataUri = 'data:text/javascript;charset=utf-8,export default "hi"'
  const { default: hi } = await import({ toString: () => dataUri } as string)
  expect(hi).toBe('hi')
})