Results file schema validation fails for results object use of boolean for "actual" field.

[preston]

Using Ajv, validation of cql-tests-runner fails for results like this:

 {
      "testStatus": "pass",
      "responseStatus": 200,
      "actual": true,
      "expected": "true",
      "testsName": "CqlAggregateFunctionsTest",
      "groupName": "AllTrue",
      "testName": "AllTrueAllTrue",
      "invalid": "false",
      "expression": "AllTrue({true,true})"
    }

...because the schema defines "actual" as being a string. It works in apps without validation due to automatic boolean -> string type conversion, but fails when validation is enabled. :)