Implement function to store SQLite database entities from raw notification string in SQLite database

Summary: This diff uses function implemented in previous diff to store ntification in Sqlite database.

Test Plan: No testing plan. Future diffs will provide a code that uses those functions on iOS and Android respectively

Reviewers: palys-swm, karol-bisztyga

Reviewed By: palys-swm, karol-bisztyga

Subscribers: ashoat, Adrian, atul, yayabosh

Differential Revision: https://phab.comm.dev/D3986