feat: Add AIX platform support to common package with uptime and boot time functions

[Dylan-M]

Description

This PR adds comprehensive AIX (ppc64) platform support to the gopsutil common package.

Part 1 of splitting #1969: Prerequisites

Changes

• Labeler Configuration: Added AIX to the GitHub labeler for better issue/PR organization
• Common Package: Implemented new common_aix.go module providing:
  • BootTimeWithContext(): Calculates system boot time
  • UptimeWithContext(): Retrieves system uptime using ps command
  • ParseUptime(): Parses ps etimes output into total minutes, handling multiple time formats
• Host Package: Refactored host_aix.go to delegate uptime/boot time functions to common package
• Tests: Added comprehensive unit tests in common_aix_test.go covering valid and invalid uptime parsing scenarios

Implementation Details

The AIX implementation uses ps -o etimes -p 1 to retrieve the elapsed time for PID 1, which supports the following formats:

• DAYS-HOURS:MINUTES:SECONDS (e.g., "124-01:40:39")
• HOURS:MINUTES:SECONDS (e.g., "15:03:02")
• MINUTES:SECONDS (e.g., "01:02" on just-rebooted systems)

This approach is more robust than parsing the uptime command output and provides better accuracy for the AIX platform.

[shirou]

Overall LGTM, but could you check my comment? Thanks!

[Dylan-M]

Overall LGTM, but could you check my comment? Thanks!

Done, addressed, and ready for your re-review.

Is there anything I can do for you or help with to accelerate your review/testing of this PR set?

I can help with temporary access to an AIX system if that would help. I would just need a more private contact for you. If you're on the CNCF Slack, we could chat there.

[shirou]

LGTM! common.timeSince is the same as the one in host/host.go. I'll open another PR to have host.go use this common function. Thanks!

[Dylan-M]

LGTM! common.timeSince is the same as the one in host/host.go. I'll open another PR to have host.go use this common function. Thanks!

That is handled by one of my follow on PRs

EDIT: Nevermind, I seem to have missed that one. :)