Automatically update facebook API version

[absorbb]

Problem

Facebook often upgrade API version without breaking compatibility. Nonetheless previous API endpoint stops working

Solution

Find a way to detect current version of Facebook API Introduce service that starts once facebook source or destination added to instance. Service periodically (e.g. Once a day) get latest version of Facebook API facebook_marketing.go and facebook_conversion_api.go uses this version instead of hardcode

[jfk9w]

Facebook source will be implemented with JS jitsu-sdk, so we'll postpone the issue till then.