refactor(cli): Move sysinfo formatting into its own function

[amithadityacp]

Description

This pull request refactors the --sysinfo command output for better code organization and readability, following the Single Responsibility Principle.

Changes Made

• Moved the output formatting logic from the main() function directly into the get_system_info() function.
• The get_system_info() function now returns a fully formatted, multi-line string, making it a self-contained utility.
• The if sysinfo: block in the main() function is now simplified to a single, clean print() call.

Related Issue

Closes #1194

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[!IMPORTANT] Refactors --sysinfo command output by moving formatting logic to get_system_info(), simplifying main() function.

• Behavior:
  • Refactors --sysinfo command output in main() by moving formatting logic to get_system_info().
  • get_system_info() now returns a formatted string with system details.
  • Simplifies if sysinfo: block in main() to a single print() call.
• Functions:
  • get_system_info() now includes formatting logic for system information.
• Misc:
  • Closes issue #1194.

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