Add "Please Wait" or spinning cursor while loading large payloads

I thought I was not getting any received payload but turns out it was a large payload and Proxyman was just processing it. I didn't sit and stare at the Body tab and wait. I just glanced and expected the Body to be there but it wasn't. Turns out, it was a large payload and it took several seconds to load in Proxyman

Proxyman version? (Ex. Proxyman 1.4.3)

Version 2.1.1 (20110)

macOS Version? (Ex. mac 10.14)

10.15.5 (19F101)

Steps to reproduce

Click on an entry in Proxyman that has a large payload and click on the Body tab
Notice the wait with no spinning cursor or any indicator that Proxyman is loading the payload

Expected behavior

Create a spinning cursor indicator so it doesn't look like there was no payload

Screenshots (optional)