AIP31 implementation: targeting + supermarket

[Ivshti]

• refactor/rewrite so that demand will be retrieved via supermarket (/units-for-slot)
• decide whether to still allow retrieving demand via market (/campaigns) - no, cause the JS market will have /units-for-slot too
• implement new rule matching engine
• needs to collect data on what ads were shown (to apply freq capping rules by defining adView.secondsSinceCampaignImpression)
• needs to collect data what ad slots were visited the most (as part of the AdEx Profile - we will either use data to match targeting rules against it, or to hint the user into choosing their preferred categories in the Profile UI by aggregating most visited categories of sites)
• implement the Profile API