Cohort API: Implement predefined filter functionality for complex datatypes

[snathanvj]

TO DECIDE:
Do we need to keep false values here ,

"dataTypes": {
"biospecimens": true,
"environmentalData": true,
"genomicData": false,
"phenotypicData": false
},

Can't it be simply

"dataTypes": [ "biospecimens", "environmentalData"]

@amnonkhen @theisuru

[snathanvj]

pushed changes :
java:Converted DataType to enum contants
db: changed dtaaType to String array

[theisuru]

This model is taken from BMMRI model. So we might need it's structure.
The "other" entry could hold text value for other data types, any idea how we can store them if we keep a ENUM?