Add apn data structure

This add a data structure to store the apn data locally.

Test: unit test
Bug: 73745458
Bug: 67327863
Merged-In: Iae56583ab1c99f57154461c71a10b74db87ab1bd
Change-Id: Iae56583ab1c99f57154461c71a10b74db87ab1bd
(cherry picked from commit ee25956f573efcbbb6e1968ff4cdfe24c65e1bb4)
2 files changed