Allow full dry-validation schemas to be used inside actions

[timriley]

[krzykamil]

I have a WIP on this https://github.com/krzykamil/controller/pull/1 but it's early stages, so far I just made two happy path basic specs and made them pass. I will iterate over it in the next couple of days, but any input would be helpful at any time since this is a bit of a deep dive for me.

[parndt]

@timriley is this related to #434 ?

[timriley]

@parndt yes, any new work on this will supersede that earlier PR.

[krzykamil]

Here is the PR, now pointing to the main repo https://github.com/hanami/controller/pull/451