Update BritePool UserId Module to support dynamic Params

[edahood-sonobi]

Type of issue

Feature Request

Description

Add a new Parameter called "dynamicVars" which should be the name of a variable on "window" which can be merged into the other parameters which are set statically.
The default value of the "dynamicVars" should be "bpParams", which when found would be merged.

This feature is meant to allow a managed version of prebid to easily set hash and ppid without having to change the prebid config or set it in the config directly.

If no variable is found on the window or the variable is not an object, the code should just skip over trying to merge the variables in, no error should be thrown or logged.

Platform details

browser