Introduce an abstraction that automatically add try behaviour to strict services

[marian13]

##
# "Tell, don't ask" is followed.
#
step Services::TryReadPresentValueFromRegistry,
  in: [:registry, :method, :args, :kwargs, :block],
  out: :value

##
# "Tell, don't ask" is violated.
#
step Services::ReadPresentValueFromRegistry,
  in: [:registry, :method, :args, :kwargs, :block],
  out: :value,
  try: {value: -> { User.none }}

Questions:

• Is it reasonable enough to violate the "Tell, don't ask principle"?