[pm][metrics] add frozen latency to metrics

Add the metric to measure frozen latency for intall. The freezen
may be triggered by delete, we only focus on install case now.

Bug: 296993879
Test: manual with statsd_testdrive 524. See result in bug.
Test: atest PackageFreezerTest

Change-Id: Ic0783efefaf7b757021e4274076112ac0591c2a9
10 files changed