[Providers] Add docker support

[pepoviola]

The Vision

Zombienet provides multiple providers to allow users run their networks where they need (e.g k8s, podman, native). We want to keep adding support for other providers and we think that adding docker as provider will allow newcomers to easily start using zombienet and will create a more smooth setup/introduction of the features that we provide.

The Plan

Ones we have an stable version of the sdk we will start working on this tasks to add docker as provider option.

Tasks

• Docker (./crates/providers/docker - features = "docker") #38
• [Docker] Add integration test in GHA #61
• [Setup] make Docker the default provider for setup #62