Schema for validation of extra values applied on packaged charts

[fstaudt]

When extra values are configured after Helm packaging, an extra level needs to be added with the name of the current chart.

helm-chart:
  ...

The aggregated JSON schema can't therefore be used to validate this extra values file.

The new packaged JSON schema should be generated by JsonSchemaAggregator and should reuse aggregated JSON schema:

{
  "properties": {
    "global": {
      "$ref": "aggregated-values.schema.json#/properties/global"
    },
    "helm-chart": {
      "$ref": "aggregated-values.schema.json"
    }
  },
  "additionalProperties": false
}

It should be applied automatically by IntelliJ plugin to all files named "*-values.yaml" in the root folder of the helm chart.