feat: basic helm chart

[just-mitch]

As a developer, I want a base Helm chart for the Aztec network so that I can easily deploy configurable network topologies.

- [ ] Define chart structure
- [ ] Create templates for each component (boot node, full node, validator, prover node, prover agent, PXE)
- [ ] Define configurable parameters in values.yaml
- [ ] Implement resource requests and limits
- [ ] Add documentation for chart usage