`v1` version support define a parachain with a single collator using
`[parachain.collator]` (note this is a map and not a sequence). But in
the `sdk` we drop support in favor of always use a vec<NodeConfig>. This
pr allow to use the old toml definition __only__ with the load_from_toml
method.

cc:  @AlexD10S

Couple of fixes for docker provider and to use an external tool to build
the chain-spec.

A follow-up of #171 with the same motivation.

Add small validation, mostly to ensure that the `image` is set in k8s.

fix #143

Add: Manual variant to `RegistrationStrategy`, allow to deploy the
collators _but_ not register the para.
Fix: `created_paths` in native provider
Fix: Use `rpc` port for ws connections (orchestrator)

This pr make possible to add a new parachain to a running network (see
`add_para.rs` example), for that we allow to create a new parachain
config (using the same builder but in a different context) like this:

```rs
let para_config = network.para_config_builder()
        .with_id(100)
        .with_default_command("polkadot-parachain")
        .with_collator(|c| {
            c.with_name("col-100-1")
        })
        .build()?;
```
And then deploy that parachain by calling `add_parachain` (the second
parameter of the fn allow to use a custom chain-spec for the
relaychain).

```rs
network.add_parachain(&para_config, None).await?;
```

// TODO:
- [x] docs
- [ ] test (integration)

just wanted to throw a quick implementation that exposes the
OnclineClient on the node.
This would make the sdk super useful to enable cross chain e2e tests in
ink!

---------

Co-authored-by: Javier Viola <pepoviola@gmail.com>

In order to ensure that backward compatibility with existing node
Zombienet, this PR migrates (as a start) a [simple example of a test
from
Polkadot-SDK](https://github.com/paritytech/polkadot-sdk/blob/0a6dfdf973b8e7b669eda6e2ed202fb3549a20b9/polkadot/zombienet_tests/smoke/0001-parachains-smoke-test.toml),
and fixes some bugs in order to make the test work;

- Added genesis_overrides fields to RelaychainConfig and ParachainConfig
builders and added logic to merge it into the specs being created

Remove chain_context from loops; Remove pub(crate) from ChainDefaultContext and add getters/setters; Adjust rest of code for the previous changes

feat: renamed initial_balance to balance and is_cumulus_based to cumulus_based in ParachainConfig serialization to handle zombienet node version mapping

Signed-off-by: muraca <mmuraca247@gmail.com>