[Feature Request] Implement efficient file download functionality similar to Penelope's approach

[strikoder]

I've used Villain and noticed it currently supports uploading but lacks a robust file download feature (victim → attacker). I wanted to suggest implementing something similar to what Penelope Shell Handler does, which handles this elegantly.

Proposed: Add a download command with:

• Streaming tar.gz transfer (minimal footprint on victim)
• Glob pattern support (/etc/*.conf, /var/log/*)
• Automatic space validation and error handling
• Directory structure preservation

Usage:

download /etc/passwd <session_id>
download /var/www/html/* <session_id>

Reference: Penelope Shell Handler has a clean implementation using in-memory tar streams over existing session channels.