[Request] Add Parity Rebuild status

[Shadewing666]

Hi, just installed this on my server which I had also just replaced the parity drive in and I noticed that the ParityCheckRunning state was false.

Which is true I suppose, it is not a parity check that is running, it is a rebuild.

This seems like a status that would be worth monitoring, along with the Elapsed Time, Current Position, and maybe Estimated Speed. I'm not sure Estimated Finish is needed or not.

Basically looking for this info block, I clipped it from the Main page in Unraid.