Add Transformations for generating App Engagement reports for Facebook Ads

This MR updates the existing models and adds new transform models to support the generation of App Engagement reports.

Summary of updates introduced:

1. Restructure base models to use macros as a SSO for all the common dimensions and metrics in all Add Insights Tables.

2. Calculate additional metrics in All base Ad Insights Models (so that they can be used by other, more advanced, models)

   • actions_link_clicks
   • actions_page_likes
   • actions_post_engagements
   • actions_post_reactions
   • actions_post_comments
   • actions_post_shares
   • actions_post_saves
   • actions_app_installs
   • actions_mobile_app_installs
   • actions_omni_app_installs
   • actions_event_responses
   • actions_conversions
   • actions_video_views
   • actions_leads
   • actions_messages

3. Add new App Engagement per XX transform models

Closes #5 (closed)