Add metrics for AutoDataSwitch

Add DataCallSessionStats.is_non_dds and
DataStallRecoveryReported.other_phone_signal_strength to track the
effectiveness of auto data switch feature.

AMD: https://eldar.corp.google.com/assessments/296451350/drafts/795146072?jsmode=o#sections/999001
PDD: https://eldar.corp.google.com/assessments/653114600/drafts/771765910?jsmode=o#sections/55001

Bug: 253081968
Test: pull and check DataCallSessionStats.is_non_dds on local device +
basic data browsing + phone call

Change-Id: If8342b9150d56546c85c1a9ad255f4d17c5c04bc