Allow multiple conditions

[whisperingpixel]

Is your feature request related to a problem? Please describe.
Currently, only one (attribute) condition is possible

Describe the solution you'd like
Allow multiple conditions in the form of (or similar):

{
  "operator": "and",
  "operand": {
        "property":"avg(ndvi)",
        "value":0.2,
        "operator": "gt"
  },
  "operand": {
        "property":"avg(ndvi)",
        "value":0.2,
        "operator": "gt"
  }
}