Add: 
 - Bump subxt version
 - Change visibility for internal crates

Change exports.

@rzadp @Bullrich

Includes:
- wait methods for `metrics`
- wait methods for subxt client.

- pjs-rs behind feature gate
- Docker fixes

fix #214 
- Fix docker leaking containers
- Also fix docker download helpers
- Improve docker rm _namespaced_ containers



cc: @michalkucharczyk

This pr introduce the ability to set the `base_dir` used by the
`namespace`. This allow users to reuse the same node's directories
(config and database) and re-start the network from the latest state in
sequential runs.

Thx!

fix #218

cc @sandreim thanks for the suggestion :)

fix #210 

Also fix the log cmd string.

cc @michalkucharczyk , thanks!!

Firstly, thank you for an amazing library! The original zombienet is a
Polkadot staple and now being able to use it completely from Rust is a
game changer for us: as you may be aware, we have integrated
zombienet-sdk with
[pop-cli](https://github.com/paritytech/zombienet-sdk).

In doing so, we needed to add a few getters to the public api to be able
to present certain information to the user, as well we expose a little
more of the inner errors. This PR simply upstreams these changes.

It also includes two additional fixes, which may be better implemented
based on your guidance:
- collator args werent working for us when specified in a config file,
which seemed to be due to missing `--` in the args list provided by
calling functions.
- artifact path wasnt set when trying to build a chain spec. This may no
longer be required based on the changes in
https://github.com/paritytech/zombienet-sdk/commit/c7ce50c0

I am happy to add...

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

docker support 

---------

Co-authored-by: Javier Viola <javier@parity.io>

Add:
 - logs methods in NetworkNode

- [k8s] fix `cmd` generator for collators (needs to use exposed ports).

based on #190 

cc: @s0me0ne-unkn0wn