Process Acquisition Report Asynchronously

[amalnanavati]

The web app currently invokes the acquisition report service and a motion action at roughly the same time. However, empirically, it seems like rosbridge can only process them one-at-a-time, and in practice ir waits for the acquisition report to succeed before processing the motion. Given this, we should spin off a new thread to process the acquisition report service (e.g., return a succesful response to ROS and then do the work) to allow for greater concurrency.

(We should also dive deeper into the rosbridge issue and create an upstream issue about it.)