topdown/rego: Add BuiltinErrorList support to rego package, add to eval command (#5487)

```
$ cat pol.rego
package play

this_errors(number) := result {
        result := number / 0
}

this_errors_too(number) := result {
        result := number / 0
}

res1 := this_errors(1)

res2 := this_errors_too(1)

$ go run main.go eval --show-builtin-errors -d pol.rego data.play
{
  "errors": [
    {
      "message": "div: divide by zero",
      "code": "eval_builtin_error",
      "location": {
        "file": "pol.rego",
        "row": 4,
        "col": 12
      }
    },
    {
      "message": "div: divide by zero",
      "code": "eval_builtin_error",
      "location": {
        "file": "pol.rego",
        "row": 8,
        "col": 12
      }
    }
  ],
  "result": [
    {
      "expressions": [
        {
          "value": {},
          "text": "data.play",
          "location": {
            "row": 1,
            "col": 1
          }
        }
      ]
    }
  ]
}
```

Signed-off-by: Charlie Egan <charlieegan3@users.noreply.github.com>