No progress feedback for asdf plugin add commands

[SailNCode]

Is your feature request related to a problem? Please describe

Problem

asdf plugin add java and similar commands provide no visual feedback, making it unclear if the installation is working, stalled, or has failed.

Steps to Reproduce

Run asdf plugin add java

• Terminal shows no progress indication
• User waits without knowing if the process is working

Expected Behavior

• Show progress indicator (spinner/dots)
• Display status messages ("Downloading plugin...")

Current Behavior

Silent operation that appears frozen

This particularly affects new users who may assume the tool is broken.

Describe the proposed solution

• Add progress indicators during download/installation
• Show status messages at each step
• Ensure errors are clearly displayed

Describe similar asdf features and why they are not sufficient

Describe other workarounds you've considered

[lstrzelecki]

This is a great idea 💡 showing a spinner or some form of progress feedback would really help make it clear that asdf is doing something. Right now, the lack of output can easily make users think the tool has frozen, especially during longer plugin installations. A small change like this could significantly improve the user experience, particularly for newcomers.