Add possibility to ignore property when building query

[Exellion]

The problem described in bug

I believe it will be useful if we can omit some properties when using Query attribute. For example, I have query model:

public class QueryParams
{
     [AliasAs("data")]
     public string Data { get; set; }

     // Some property for internal use only. Should be omitted in any query
     public string SomeForInternalUse { get; set; }
}

and some query:

[Post("/api/v1/someEndpoint")]
Task MakeRequestAsync([Query] QueryParams parameters)

I need to ignore property SomeForInternalUse

My proposals:

1. Add [QueryIgnore] attribute
2. Alternatively, use [AliasAs(null)] (it works previously and was unknowingly fixed in 1b45219)