@analytics/google-analytics: Not being able to track custom dimension

Hi,

I really like the library. But I have a weird issue I am not able to solve and also looking through the docs and checking the code did not help. I am trying to add a custom dimension in Google Analytics' browser for a page.

Analytics({
  app: 'my-app',
  plugins: [
    googleAnalytics({
      trackingId: 'my-tracking-id',
      anonymizeIp: true,
      customDimensions: {
        userState: 'dimension1',
      },
    }),
  ],
}),

later I call the following

// i tried
this.analytics.page({}, { userState: true });
// also
this.analytics.page({}, { customDimensions: { userState:  true } });

but looking at the code it seems that custom dimensions are tried to be found in PageData instead of the passed options. This of course does not work because PageData types do only allow certain keys

Start at the googleAnalytics plugin's page entry point and inspect how PageData and the options passed to analytics.page are used for custom dimensions. Reproduce the two page calls from the issue and verify that a configured userState dimension is sent to Google Analytics from the intended input.