Account level targeting config

[bretg]

It's not optimal that stored requests have to contain ext.prebid.targeting values for AMP and SDK scenarios. This creates a need to update many DB entries if there's a change (e.g. in how they want deals prioritized). It would be more convenient to have the account-level config store the target settings.

Suggested config:

auction:
    truncate-target-attr: 20      // we should move this under targeting with a future major release
    targeting:
        includewinners: true/false
        includebidderkeys: true/false
        includeformat: true/false
        preferdeals: true/false
        alwaysincludedeals: true/false

And, as usual, if the value is seen in both the request/stored-request AND config, request takes precedence.

[bretg]

discussed in committee and approved without the move of truncate-target-attr

[bretg]

released with PBS-Java 2.3