Switch podman firewall driver to nftables

Feature requests
1

then iptables would be removed from system .

2

Any downsides or estimated rework of vyos-configd related stuff (templates etc)?

Please file this as a feature request over at https://vyos.dev

3

maybe the new podman 5.8.4 will use nftables as default ,waiting to test the latest rolling version.

If it works , just need to remove the lines below :

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I just noticed , netavark is still not upgraded to latest , that would be the blocker , should be upgrade it to 1.17 first .