[Bug]: `aggregate_records` should default fields to `*`

[JerryNixon]

If it is possible, it would align well.

tool

{
  "tools": [
    {
      "name": "aggregate_records",
      "inputSchema": {
        "type": "object",
        "properties": {
          "field": {
            "type": "string",
            "description": "Field name to aggregate, or '*' with count to count all rows."
          },
       }
     }
    }
  ]
}

desired state

{
  "tools": [
    {
      "name": "aggregate_records",
      "inputSchema": {
        "type": "object",
        "properties": {
          "field": {
            "type": "string",
            "description": "Field name to aggregate, or '*' with count to count all rows.",
            "default": "*" // new default value
          },
       }
     }
    }
  ]
}