Build out feature vectors based on expected schema from ML core

[mrhorvath]

Kibria can probably share an example. Right now its count (backwards from 18 weeks) of every ICD10 code in the last week, 3 weeks, 6 weeks, 9 weeks, 12 weeks, ever (18 weeks). Same for drugs, procedures, labs, and vitals. Labs and vitals also have mean and max in the time period.