Include simple high level data report with grading view

This is an idea that's been bouncing for some time in external conversations with instructor users and in internal experiments with @judell and @xolotl: a report or dashboard on student activity in a course.

What I'm proposing here after talking to a couple of users this morning is that the LMS app _eventually_ include some simple high level data points along with whatever artifact of activity (actual annos and replies) is offered.

Here's a crude sketch (note it's not actually the additive/interesting because the number of annos and replies is small):


While this sketch includes two simple data points, it obviously could include more. And what is included could perhaps eventually be customizable by the instructor. One of the teachers I talked to this morning was interested in the multimedianess of annotations (how often image and videos were used) and the sociality of students (how engaged with others, interactive with others, a student was).

@judell created a [StudentReview](https://jonudell.info/h/StudentReview/) tool in conversation with a teacher that demonstrates a wide range of data points an instructor might be interested in. (Note that Jon's readout here is on a per course basis rather than per assignment or h-enabled reading).


I know this is all for a bit down the line but wanted to document these conversations and thoughts somewhere.

CC @katelyn @ajpeddakotla @lyzadanger @seanh