Support disabling timeout mid-way through

[rmosolgo]

Now, inside handle_timeout, you can disable the timeout for the rest of the query like this:

class MyCustomTimeout < GraphQL::Schema::Timeout 
  def handle_timeout(error, query)
    if some_condition?
      disable_timeout(query) 
    else 
      # raise error, or log it, etc 
    end 
  end 
end