Added SIM events handling and fix crashes

1. Added SIM events handling in subscription manager service.
2. Fixed all crashes found during boot up.
3. Update subscription before broadcasting carrier config changed
   event.

This is same as the reverted ag/20813887.

Bug: 239607619
Test: Manual
Merged-In: Ic3c2cd6ae21ec5199637d609c20d361b17de0726
Change-Id: Ic3c2cd6ae21ec5199637d609c20d361b17de0726