Support enable_ipv6 for networks

[claraphyll]

Is your feature request related to a problem? Please describe. I cannot automatically create networks with dual-stack support with podman-compose up so I have to edit the network json manually. This is also in the compose spec [1] and supported by docker compose Describe the solution you'd like When enable_ipv6: true is given for a network, the --ipv6 flag is passed to podman network create Describe alternatives you've considered This can currently be done by creating the network manually or editing the network's json file. Additional context I've opened #749 which implements this.

[1] https://github.com/compose-spec/compose-spec/blob/master/06-networks.md#enable_ipv6

[sgryphon]

Yes please