support defining expects and promises in a .chain call

[markburns]

organize \
  DoFoo,
  DoBar = self.if(
    :success,
    then: DoBaz = chain('DoBaz', A, B, C),
    else: Qux
  )

Here we have to use chain when assigning to a testable constant DoBaz

but if A expects something, then the interactor wiring specs will fail. Meaning you have to fully extract a class.

class DoBaz
  include Interactify
  expect :a
  organize A, B, C
end

organize \
  DoFoo,
  DoBar = self.if(
    :success,
    then: DoBaz,
    else: Qux
  )

OR we can do

organize \
  DoFoo,
  DoBar = self.if(
    :success,
    then: DoBaz = chain('DoBaz', A, B, C).expect(:a),
    else: Qux
  )

but here the expect can come visually far away from the start of the chain.

May be nice to have to do

organize \
  DoFoo,
  DoBar = self.if(
    :success,
    then: DoBaz = chain('DoBaz', A, B, C, expect: :a),
    else: Qux
  )

organize \
  DoFoo,
  DoBar = self.if(
    :success,
    then: DoBaz = chain('DoBaz', expect: :a, A, B, C),
    else: Qux
  )

Also to investigate why wiring specs are not passing in previous contract info into if and chain calls