feat: add anonymous analytics tracking with opt-out

[solidspark]

Summary

Add analytics to track installer flow for quality assurance and bug tracking.

Events Tracked

Event	When	Properties
hubble-install-start	At launch	platform, arch
hubble-install-step	Each step (1-5)	platform, arch, step, step_name
hubble-install-error	Any error/exit	platform, arch, step, step_name, error
hubble-install-success	Successful completion	platform, arch, duration_seconds, board

Privacy Features

• Anonymous: All tracking uses UserId='anonymous' - no personal identifiers
• Sanitized errors: Home directory paths are replaced with ~ before sending
• Opt-out support: Users can disable tracking via:
  • Environment variable: HUBBLE_NO_ANALYTICS=1
  • Command line: a=false or --no-analytics

Usage

# With analytics (default)
curl -fsSL https://get.hubble.com | bash -s <credentials>

# Without analytics
curl -fsSL https://get.hubble.com | bash -s <credentials> a=false

[matt0x6F]

love a good opt-out