Fix compose inputs

[spencersteiner]

While upgrading to active interaction 5.0.0 I found that the inputs must be a hash or ActionController::Parameters argument error is being raised when inputs are composed within an interaction (i.e. compose(Multiply, inputs) ). It looks like that error will be raised unless they are a hash or an ActionController::Parameters instance when we probably want to also allow them to be Inputs for composition.

I wrote two test cases, one for the #normalized method where the error gets raised to make sure it does not when they are of type ActiveInteraction::Inputs and one for the #compose method directly to ensure it is a valid outcome for both a hash or an Inputs instance.

It's my first time reading through the library source, so if I'm missing anything obvious or there is a better way to approach this let me know how I can help!

[AaronLasseigne]

Thanks! I noticed a small change but otherwise this looks great. It also made me realize I should probably add the ActiveSupport Hash extension methods to Inputs.