Unify order of output

[tschmidtb51]

Currently, there are many different ways the json output is ordered in different tools (csaf-validator-lib, csaf-validator-service, csaf_validator).

[tschmidtb51]

The preferred output should use the order:

   {
      "errors": [],
      "warnings": [],
      "infos": [],
      "isValid": true,
      "name": "informativeTest_6_3_9"
    }

[tschmidtb51]

Also, it must be checked that the documentation is up-to-date / whether changes in the documentation must be made.