Link COPPA flag to Activity Controls

[bretg]

Towards pushing forward with making Activity Controls more complete, I propose that we link regs.coppa to an Activity Control similar to what we've done for GPC. This paves the way for someday, in a major release, dropping the built-in COPPA functionality and getting host companies to set default Activity Controls.

e.g. anonymize ACTIVITY when the regs.coppa flag is set:

{
  privacy: {
    allowactivities: {
      ACTIVITY: {
        rules: [{
            condition: {
                coppa: "1"
            },
            allow: false
        }]
      }
    }
  }
}

[bretg]

Discussed - this something we'll wait on for a major release.