Expose services of type dataProduct special

[swennemers]

To support a new service type for dataProduct exposure, we need these specially annotated services to be exposed as a special API resource.

If @DataIntegration.dataProduct.type: 'primary' (we ignore other values) should result in

"apiResources": [
    {
      //...
      "apiProtocol": "rest",
      "visibility": "internal",
      "direction": "outbound",
      "implementationStandard": "sap.dp:data-subscription-api:v1",
      "entryPoints": [],
      "resourceDefinitions": [
        {
          "type": "sap-csn-interop-effective-v1",
          "mediaType": "application/json",
          "url": "<tbd>/Product.csn.json",
          "accessStrategies": [
            {
              "type": "open"
            }
          ]
        }
      ],

```