feat: Allow passing a root option that is different than Vite's root

[ElMassimo]

Description 📖

This pull request closes #2 by adding a root config option to resolve files against, instead of using Vite's root.

Usage 🚀

import LiveReload from 'vite-plugin-live-reload'

export default defineConfig({
  plugins: [
    LiveReload(['config/routes.rb', 'app/views/**/*'], { root: process.cwd() }),

Background 📜

Implemented something similar to this library because I needed it, but before publishing I found this package, and thought it would be nicer to contribute to it instead.

[arnoson]

Looks great! I've been thinking about the same feature as I use the plugin mainly to watch files outside of Vite's root, thank you very much for adding it :) I will merge it and release a new version soon

[ElMassimo]

Excellent, thank you!