Nt/notifications ordering

using gk property for time passed calculation (as used in ecency-vision)
refactored component to functional base
using memo to save uanessacry processing
using section list instead of flat list, kept the sections same as before (Recent, Yesterday, This Week and so on)
fixed logic for Last Week calculation (probably the primary reason causing sorting issue)
Renamed Label from Older than month to Last month & older as older than month seems 30+ days but section starts prior to first of current month.

ecency / ecency-mobile