Function colors_enabled 

pub fn colors_enabled() -> bool

Check if colors should be enabled.

This respects standard environment variables for color control:

• NO_COLOR=1: Disables all ANSI output (https://no-color.org/)
• CLICOLOR_FORCE=1: Forces colors even in non-TTY
• CLICOLOR=0: Disables colors on macOS
• TERM=dumb: Disables colors for basic terminals