Prebid 8 - Consolidate size mapping logic

[ChrisHuie]

This issue is to propose and track the consolidation the logic around size mapping for individual bidders

[dgirardi]

Tentative proposal:

• move the v1 logic into a module (the same sizeMappingV2 module)? and expand it to work on video/native as well
• from prebid 8, people interested in mediaQuery mapping and labels should include the module.

[dgirardi]

Related: #4135 (sizeMapping V1 does not work for video/native). This is an opportunity to consolidate v1 and v2.

[patmmccann]

Inclusion dependent on minimal configuration impact to publishers using existing module(s)