Eng comp roadmaps

These the zeroth version of the comp roadmaps I promised to deliver as a Key Result for this OKR: #3907 (closed)

FYI I'll create follow up versions for each of you to make the grades and recommendations real with Brittany's help. Thanks!

CC @clefelhocz1 @glopezfernandez @meks @kathyw @tcooney @clenneville @brittanyr