Render::Circuit: show ID and class

[apotonick]

We need to add the ability to render an activity using Trailblazer::Developer.render(activity) where we show task and its ID. Currently, it shows only the task.

#<Start/:default>
 {Trailblazer::Activity::Right} => #<Class:0x>/deserialize_nested._endpoint
#<Class:0x>/deserialize_nested._endpoint    # here is the ID
 {#<Trailblazer::Activity::End semantic=:failure>} => #<End/:failure>
 {#<Trailblazer::Activity::End semantic=:success>} => #<End/:success>
#<End/:success>