feat: add enhanced UI with color display, progress tracking, and scan stats

[fadhilyori]

Adds a comprehensive UI refresh to improve the scanning experience. This introduces color-coded output, progress bars, tabular results, health scores, and various sorting options.

What's new

📊 Improved results display

• Results now shown in a clean table with columns for IP, status, latency (min/avg/max), packet loss, and jitter
• Status icons (●/○) for quick visual identification
• Color-coded rows based on latency performance
• Sortable by IP, latency, packet loss, or jitter (use --sort flag)

📈 Network health scoring

• Automatic health score calculation (0-100) based on online/offline ratio
• Descriptive labels (Excellent/Good/Fair/Poor/Critical)
• Enhanced scoring available with detailed metrics consideration

⏱️ Progress tracking

• Real-time progress bar showing current scan progress
• Displays current IP and online count
• Progress callback support for custom integrations

📝 Summary improvements

• Scan rate display (hosts/sec or hosts/min) alongside execution time
• Color-coded summary based on network health percentage

🎨 Visual enhancements

• Color support for terminal output
• Automatic color detection (respects NO_COLOR env var)
• Consistent color scheme for better readability

New dependencies

• fatih/color - Colored terminal output
• olekukonko/tablewriter - Table formatting
• schollz/progressbar/v3 - Progress bar display

Usage examples

# Default display
subping 192.168.1.0/24
# Sort by latency
subping 192.168.1.0/24 --sort latency
# Sort by packet loss
subping 192.168.1.0/24 --sort loss

Breaking changes

• ResultDisplayer.ShowSummary signature changed - now includes rate parameter
• Custom implementations of display interfaces may need updates