feat: aztec-network helm chart

[just-mitch]

Initial definition of the helm chart for an "aztec-network".

Currently not part of CI (that is https://github.com/AztecProtocol/aztec-packages/issues/8000).

However, a meaningful smoke test is included that can be run with:

./yarn-project/end-to-end/scripts/setup_local_k8s.sh
earthly ./yarn-project/end-to-end/+network-smoke