Convert JSON Array to CSV

syntax = "proto3";

message MyMessage {
  Vessel vessel = 1;
}

message Vessel {
  string name = 1;
  string registry = 2;
  string class = 3;
  string status = 4;
  bool commissioned = 5;
  int64 launch_year = 6;
  repeated Seniorstaff senior_staff = 7;
  Systems systems = 8;
}

message Seniorstaff {
  string name = 1;
  string position = 2;
  string species = 3;
}

message Systems {
  Warpdrive warp_drive = 1;
  Shields shields = 2;
}

message Warpdrive {
  double max_speed = 1;
  string manufacturer = 2;
}

message Shields {
  string capacity = 1;
}

// Corresponding TextProto data representation:

vessel {
  name: "USS Enterprise"
  registry: "NCC-1701-D"
  class: "Galaxy-class"
  status: "Active"
  commissioned: true
  launch_year: 2363
  senior_staff {
    name: "Jean-Luc Picard"
    position: "Captain"
    species: "Human"
  }
  senior_staff {
    name: "William T. Riker"
    position: "First Officer"
    species: "Human"
  }
  senior_staff {
    name: "Data"
    position: "Second Officer"
    species: "Android"
  }
  senior_staff {
    name: "Worf"
    position: "Chief of Security"
    species: "Klingon"
  }
  systems {
    warp_drive {
      max_speed: 9.6
      manufacturer: "Yoyodyne Propulsion Systems"
    }
    shields {
      capacity: "4,590,000 TJ"
    }
  }
}