feat: add sysdump as subcommand

[linglilongyi]

Background

To dump up the system network config for debugger.

Checklist

• The Pull Request has been fully tested
• There's an entry in the CHANGELOGS
• There is a user-facing docs PR against https://github.com/daeuniverse/dae

Full Changelogs

• feat: new subcommand sysdump

try to generate a file sysdump.tar.gz at the working dir contain five six file:

• interfaces.txt # based on netlink
• rounting.txt # based on gopsutil
• sysctl.txt # walk through the file in /proc/sys/net"
• nftbales.txt # if nft list ruleset is executable.
• iptables.txt # if iptables-save is executable.
• ip6tables.txt # if ip6tables-save is executable.

Issue Reference

keep opend #524

Test Result

https://pastebin.com/6EAL0EV3

[jschwinger233]

Well done! Just left some minor comments, should be easy to handle.

[jschwinger233]

Thank you!

[dae-prow]

🧪 Since the PR has been fully tested, please consider merging it.