WIP: add automated lit integration

[43081j]

Just a PR containing the stuff that was in #2

Implementing an "auto" version of the lit integration which tracks atoms and observes the right ones automatically.

Usage:

export class MyElement extends AtomLitElement {
  render() {
    return html`
      <button @click="${() => setCount(old => old - 1)}">-</button>
      <span>${count.getState()}</span>
      <button @click="${() => setCount(old => old + 1)}">+</button>
    `;
  }
}

Couple of thoughts:

• Can it be typescript? pretty please 😆
• I named it AtomLitElement to follow the same convention lit-mobx and a few others did (*LitElement)
• we should align the two integrations some way (name them similar or combine them into one configurable integration)
• a formatter like prettier or clang might be nice
• i tried to add tests but wtr doesn't work on chromeos so i have no clue if they fail