fix: ss not found in MacOS

[wesbragagt]

Adds a check before using ss and fallsback to netstat. This allows MacOS users to use the pf-buildkit command.

Fixes this issue: https://github.com/Panfactum/stack/issues/68

[fullykubed]

Good find!

However, this fix has some downsides:

• It relies on tools not uninstalled in the devenv
• Neither ss nor netstat are actually platform agnostic

Both of these are also problems in the original implementation as well.

I have taken the fix a different direction using lsof which should have the same behavior on all platforms. I have also added it to the devenv.

Thank you for this though as it helped provide a foundation for exploring the solution space.