Support for configuring static ipv6_address (compose and nerdctl run)

### What is the problem you're trying to solve

Configure a static ipv6 address through the service parser in compose.

### Describe the solution you'd like

Parse ipv6_address field, similarly to the ipv4_address field.

### Additional context

The underlying plumbing is all there, we just need to add another few lines of code to deal with the parsing.