Consider support of tag_sizes support for multi scale detection

[Dody56]

Hello,
Currently, only on size specification is supported by this projet.
We currently use the standard apriltag_ros (ROS Melodic) who permit size specification of each tag but it lake of gpu usage.

I use this feature to allow detections at different distances.
Have you planned to support configuration ? If not, is there a reason ?

Thanks a lot