[feature] add support for Advanced Matching with the Pixel

[sescobb27]

The Facebook pixel has an advanced matching feature that enables you to send your customer data through the pixel but to enable this feature, we need to modify the default FB pixel code to pass data into the pixel init call. see https://developers.facebook.com/docs/facebook-pixel/pixel-with-ads/conversion-tracking#advanced_match

fbq('init', '<FB_PIXEL_ID>', { 
  em: '', 
  ph: '',
  fn: ''
  ...
})