Show `Progress Bar` while downloading plugins from plugins.txt

### What feature do you want to see added?

I use this tool to download plugins but by default I am not able to see any progress report. My suggestion is add Progress bar or similar thing so we can check the progress of downloading plugins and their dependencies in pretty format

Note:- I know there is a verbose option but it shows lot of output data

Command i use to install plugins is
`java -jar jenkins-plugin-manager-2.12.3.jar --plugin-file plugins.txt --verbose`

Screenshot

### Upstream changes

_No response_

Start by tracing the `java -jar jenkins-plugin-manager-2.12.3.jar --plugin-file plugins.txt` command and the plugin and dependency download flow. Define the progress display behavior, including how it differs from `--verbose`, then add coverage for the chosen output and verify downloads still complete correctly.

Written by the indexing model from the issue text.