Add env-based API for cub::DeviceFor

[gonidelis]

• Add env-based cub::DeviceFor::Bulk()
• Add env-based cub::DeviceFor::ForEach()
• Add env-based cub::DeviceFor::ForEachN()
• Add env-based cub::DeviceFor::ForEachCopy()
• Add env-based cub::DeviceFor::ForEachCopyN()
• Add env-based cub::DeviceFor::ForEachInExtents()
• Add env-based cub::DeviceFor::ForEachInLayout()