Allow to specify which part of the item should be sent with AvailabilityChecks

[manuelroth]

Task

AvailabilityChecks allow to specify whether the item should be sent as part of the request:

"availabilityChecks": [
    {
      "type": "ToolEndpoint",
      "withData": true,
      "endpoint": "option-availability/chartType"
    }
  ]

It should be possible to define which part of the item should be sent like this:

"availabilityChecks": [
  {
    "type": "ToolEndpoint",
    "data": ["data", "options.chartType", "options.hideAxisLabel"],
    "endpoint": "option-availability/chartType"
  }
]