Improve Question tagging and Track progress

[johnarban]

This PR makes changes to help with accurately tracking progress and questions in the dashboard.

• Make sure we know which stage questions belong to. This is done by passing the COMPONENT_STATE to the question creation functions (some additional logic is included to capture questions from students who have gone through the story already).
• Calculate the progress in the stage. Because out stages can change, this makes sure the COMPONENT_STATE tracks the progress itself via two new computed fields max_step and progress (a float on (0, 1])

[Carifio24]

My one suggestion would be that we move these two computed fields into the BaseComponentState class so that we don't have to maintain this five times.

[johnarban]

Yeah, I thought this would be a good thing to have in the base component state as well. I will add that

[patudom]

@johnarban, I have a few additional comments:

• Are we sure the markers are indexed from 0? I am on the last marker on Stage 4, and it is giving me a progress of 106%, which makes me think they might be indexed from 1.

• Stage 2 is basically just the slideshow, so we might want to think in terms of measuring progress as the slideshow_step / slideshow_length
• Stage 6 is not padded with an extra marker, so I think progress should divide by (self.total_steps) instead of (self.total_steps - 1)
• Per Jon's point about refactoring the computed fields to the common BaseComponentState class, I guess we could have a marker_list_padded prop or just pad Stage 6 so they are all padded.

[johnarban]

I have pushed the tracking to the BaseComponentState, and modify the appropriate computed properties in ComponentState subclass for each story. The stage 2 slideshow should track the slideshow's max_step_completed

[johnarban]

closed because it now ahead of #774. See new PR #775