message: plugins/lighthouse: add lighthouse api to dev env
diff: import { createDevApp } from '@backstage/dev-utils';
  import { plugin } from '../src/plugin';
  +import { lighthouseApiRef, LighthouseRestApi } from '../src';
  -createDevApp().registerPlugin(plugin).render();
  +createDevApp()
  + .registerPlugin(plugin)
  + .registerApiFactory({
  + implements: lighthouseApiRef,
  + deps: {},
  + factory: () => new LighthouseRestApi('http://localhost:3003'),
  + })
  + .render();
  