change log level

### What motivated this proposal?

    repoURL: "https://nats-io.github.io/k8s/helm/charts/"
    targetRevision: "1.2.2"
    chart: "nats"

Easy change log level

### What is the proposed change?

Change log level using parameter in helm values like:

`logLevel: debug`

### Who benefits from this change?

_No response_

### What alternatives have you evaluated?

_No response_