Add metrics for data stall recovery enhancement

MDR: https://eldar.corp.google.com/assessments/296451350/drafts/988759905?jsmode=o

Bug: 260166714
Test: atest DataStallRecoveryManagerTest passed
      Telephony sanity test passed. Result: b/269436482.

Change-Id: I173e936315c9976a4dcbc592273e74388233f90b
Merged-In: I173e936315c9976a4dcbc592273e74388233f90b