Support for Result method

[thedevsaddam]

Result will return static type instead of interface.

const json = `{"name":{"first":"Tom","last":"Hanks"},"age":61}`
result, err := gojsonq.New().JSONString(json).FindR("name.first")
if err != nil {
	log.Fatal(err)
}
name, _ := result.String()
fmt.Println(name)

Result may contains method like: String/Int/Int32/Int64/Uint/Uint32/Uint64/Float32/Float64/[]String/[]Int/[]Uint/[]Float32 etc method

Result method name may FindR/GetR etc