Fix input validation

[lilianchiassai]

Fixes 2 issues reported in this ticket

• input fields were validated for each rule applied to the parent input, leading to multiple validation of the same object if multiple rules were applied to the parent input. Now, all rules are validated against the input parent before validating individually each input field.
• using inputs as mutation or query argument would only result in the validation of the directive applied to the argument itself. This is now fixed.

[bbakerman]

I suspect this PR has some great value in it - however since it re-wrote all the spaces and import order and so on its really hard to see whats actually changed

Finally the fact this has ZERO tests does not inspire me to accept it since how can we know it fixed anything?

[bbakerman]

I do appreciate open source contributions but they have to have tests and they should try to show only code changes

[lilianchiassai]

Hello sir!

Sorry about that. I'll try to rework that PR when I can. The formatting and testing comes from my ide/project not using the same auto formatting nor the same test framework (I don't know how to build tests with the framework included in this project), combined to a lack of time to dedicate to that.

If you want to work on the ticket related to this PR yourself, feel free! Otherwise I'll clean this up, but it might not be in the near future because I'm not using this library anymore.