Server-side renderer url metadata

[bretg]

This is the server side of PBJS issue prebid/Prebid.js#10434

@ccorbo has proposed a solution that server-side adapters specify seatbid[].bid[].ext.rendererurl.

I would counter-propose that this field should go in seatbid[].bid[].ext.prebid.meta.rendererUrl , adding this field as .RendererUrl alongside .NetworkID, etc.

Note: we added rendering fields for the SDK in #2908

[ccorbo]

Thanks Bret, your proposed location sounds goods to me. I can raise a PR to add this field.

[bretg]

@ccorbo - could you open a docs PR against https://github.com/prebid/prebid.github.io/blob/master/prebid-server/developers/add-new-bidder-go.md to show the new RendererUrl meta field option?

[SyntaxNode]

Implemented in PBS-Go 0.274.0.

[bretg]

resolved with PBS-Java 2.2