Update static styles getter to static field

[justinfagnani]

I see some patterns like this:

  static get styles() {
    return css`
      label,
      input {
        cursor: pointer;
      }
    `;
  }

Because you're using TypeScript you can write this with standard JS field syntax:

  static get styles = css`
    label,
    input {
      cursor: pointer;
    }
  `;

It's a little nicer to read and has slightly better performance in inheritance use-cases (in Lit 2 at least).

[rowanc1]

Super cool! Thanks for the tips, exciting to see these developments in the lit ecosystem!