bidWatch Analytics Adapter : 6.x code refactory + add creative endpoint

[matthieularere-msq]

Type of change

• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Other

Description of change

• Makes a dereferenced copy of events received in order to be able to modify them without altering ad delivery
• Remove ad creative code from the payload send to our endpoint to minimize its size
• Remove gdpr vendor data for the same reason (not needed as long as we have the consent string)
• Add a new endpoint call dedicated to creatives which each bid response sent individually.
• Compute cpm increment for a bid won (difference between the bid won cpm and the second best price in the same transaction)
• Call endpoint creatives only when needed based on another previous call response. This should avoid useless calls to be done.
• Code was cleaned as per advices in PR bidWatch Analytics Adapter : add creative endpoint #8710