Add query paramerter as list parameter test

I need a new test in "packages/http-specs/specs/parameters/query" to test what happen if the parameter is a list:
```
@query
listParameter: string[];
```

It's expected that the list is serialized as CSV. The scenario should ask for the person calling this test, to pass an array like {"a","b","c"], and the http part should expect to receive "a,b,c" for the query parameter.