Add some way of indicating progress on a download when `CI=true`

Is your feature request related to a problem? Please describe.
When downloading larger files in a CI with CI=true there is no way of telling the progress / speed at which things are happening. The only thing I can see is something like:

10:04:28 [Info] [Thread 0] [0]: 206 ...
10:04:29 [Info] [Thread 1] [0]: 206 ...
10:04:30 [Info] [Thread 2] [0]: 206 ...
10:04:32 [Info] [Thread 1] [1]: 206 ...

Which does not really tell me much other than that a download is apparently happening.

Describe the solution you'd like to see
I'd like to have some option so that even when CI=true I periodically get information about the progress and speed of the current download.

Describe alternatives you've considered
Not using CI=true is not an option for me, since otherwise my download doesn't even start because of the prompt that asks me to add the server to my configuration. I don't want that since I prefer to pass url and access token as part of the jf rt download command with the respective flags.

Start at the jf rt download command and trace how CI=true changes its output and how the existing download messages are emitted. Define periodic progress and speed reporting for larger downloads, then verify the output during a CI-mode download using the command's URL and access-token flags.