RTD framework

[TechDevCrew]

Dear community!

Could you please give your attention at my draft pull request:

I'm trying to implement RTD framework according this issue.
Does it correct way of implementation?
Please provide your suggestions, considerations or any help with developing this feature.

[SyntaxNode]

Thank you for opening this PR. I appreciate your interest to build this feature.

Building a new extension to Prebid Server is typically a large undertaking. The configuration, discovery of modules, runtime, handling of panics and errors, protection of shared memory, metrics, and logs are all factors which need to be considered. This also might make more sense to wait for #1734 to be implemented first.

The Prebid Server committee has not yet reviewed your request to add RTD features on the server side. The responses you've received in the issue are the preliminary personal opinions of Bret. The committee is next meeting on December 10, 2021. We'll review your request then and comment on the issue.

[SyntaxNode]

The Prebid Server Committee discussed RTD functionality and we agree with @bretg that this would be best suited for after the Modularity Framework. The hooks described in that specification are very likely sufficient for RTD if we add helper methods or framework for buffering and sending data to RTD servers.

The specification for Modularity has already been through review and is implemented by PBS-Java. We will begin to implement it in PBS-Go early next year in 2022. I'm closing this PR in favor of Modularity and you are absolutely welcomed to help us code it. If you would like, please coordinate with us on the Modularity Framework issue.

Thank you in advance for your understanding.