fix(#2195): Fix declared method for hash params with overlapping names

[jcagarcia]

Hi 👋

I was taking a look to the issue #2195 .

Seems the error is because the logic inside the handle_passed_param method is using the start_with?(key) method. So, if we have two params like :empty_hash and :empty_hash_two, as both of them share part of the key, it detects that the :empty_hash parameter has children, and it behaves in a different way and it ends returning a nil value.

For solving it, I'm checking that for having children the key of the children should start with the same key name + a [. Maybe not the better solution for checking this 🤔 so open to discussion.

[dblock]

This is simple and all specs pass, so let's go for it.