Use allOf for embedded types

[LarsStegman]

Hello,

I have these types:

package signals

type Addressable struct {
  Address int `yaml:"address"`
}

type Unitable struct {
  UnitOfMeasurement string `yaml:"uom"`
}

package A

type EntryA struct {
  signals.Addressable 
  signals.Unitable 
  Name string `yaml:"name"`
}

And I would like to generate a schema for EntryA. I would prefer this schema to look like this:

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://dev.azure.com/Allseas/Innovations/_git/CAM_scl-code-gen.git/schemas/A/entry-a",
  "$ref": "#/$defs/EntryA",
  "$defs": {
    "Addressable": {
      "properties": {
        "address": {
          "type": "integer"
        }
      },
      "required": [
        "address"
      ]
    },
    "Unitable": {
      "properties": {
        "uom": {
          "type": "string"
        }
      },
      "required": [
        "uom"
      ]
    },
    "EntryA": {
      "allOf": [
        {
          "$ref": "#/$defs/Addressable"
        },
        {
          "$ref": "#/$defs/Unitable"
        },
        {
          "properties": {
            "name": {
              "type": "string"
            }
          },
          "type": "object",
          "additionalProperties": false,
          "required": [
            "name"
          ]
        }
      ]
    }
  }
}

Currently, the schemas are merged and not reused:

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://dev.azure.com/Allseas/Innovations/_git/CAM_scl-code-gen.git/schemas/A/entry-a",
  "$ref": "#/$defs/EntryA",
  "$defs": {
    "EntryA": {
      "properties": {
        "address": {
          "type": "integer"
        },
        "uom": {
          "type": "string"
        },
        "name": {
          "type": "string"
        }
      },
      "additionalProperties": false,
      "type": "object",
      "required": [
        "address",
        "uom",
        "name"
      ]
    }
  }
}