Introduce Server Side SDK configuration properties for Creative Factory Timeout

[YuriyVelichkoPI]

Motivation

Provide publishers with an API to change the timeout for requesting and rendering the ad.

Objectives

• Introduce customization of timout properties via Server Side Configuration using the bidrequest.ext.prebid.passthrough object. See details here and here.
  • cftbanner to customize Prebid.shared.creativeFactoryTimeout.
  • cftprerender to customize Prebid.shared.creativeFactoryTimeoutPreRenderContent.
• Introduce the following policy of selecting the needed timeout in runtime:
  • If the timeout is present in the passthrough object, use it (Priority I).
  • If the timeout is set via the SDK API Prebid.shared.creativeFactoryTimeout* use it (Priority II).
  • Use the default value (Priority III).
• TBD: need to wait for pub's feedback about the default value. Maybe it makes sense to increase it.
• Add tests

[YuriyVelichkoPI]

We have a stored request on the test PBS instance that adds the sdkconfiguration passthrough entry to any response.

Stored config ID: prebid-stored-request-sdk-config

We should add the respective integration test that uses that ID in the bid request to ensure that SDK processes the server response correctly.