feat: add show_info()

[flexiondotorg]

Description

This patch adds a system information capability intended to gather relevant information when filing a bug report about stream-sprout.

It captures OS, container runtime and essential tooling versions using stream-sprout --info.

Type of change

• New feature (non-breaking change which adds functionality)
• Documentation (updates the documentation)

Checklist:

• I have performed a self-review of my code
• I have tested my code in common scenarios and confirmed there are no regressions
• I have added comments to my code, particularly in hard-to-understand sections
• I have made corresponding changes to the documentation