SignalStrengthController: validate config value before applying

This cl validates the signal threshold infos read from carrier
config and falls back to default values when validation failed.

It also reports anomaly instead of throwing exception and crashing
phone process when invalid threshold is provided.

Ut cases are also introduced to cover all supported RANs with
measurement types.

Bug: 296292890
Fix: 295567672
Test: atest SignalStrengthControllerTest
Test: Basic phone functionality tests (Activation/call/msg/data...)

Change-Id: I6eb69c58f0bb111e551f20b97596e9502f91c116