fix: use subprocess.Popen to avoid blocking due to the executable not…

[Edison-A-N]

I tried to reuse this plugin to open Cursor. Currently, there are some issues when opening Cursor from the command line on Ubuntu (refer to: getcursor/cursor#1763), which causes Cursor to fail to return correctly upon startup.

• Using subprocess.run will block and wait for the command to return:

Run the command described by args. Wait for command to complete, then return a CompletedProcess instance.
https://docs.python.org/3/library/subprocess.html#subprocess.run

• Using subprocess.Popen is non-blocking.

TODO:

More comprehensive management of the object returned by Popen.