filter report instances by a flow node duration

AT:

• A filter is added to filter report instances by one or multiple flow node durations
• The filter works for all reports
• The filtering API is documented in Confluence

Possible filter payload:

{
  type: 'flowNodeDuration',
  data: {
    flowNodeId: 'startEvent',
    operator: '>', // or <
    value: 12345,
    unit: "days"
  }
}