Bluetooth Cross Layer Event Reporting for key_missing transitions

Added metrics(frequency counter for following state transitions) for key missing state checks
1. BOND_BONDED -> ACTION_KEY_MISSING
2. ACTION_KEY_MISSING -> ACTION_ENCRYPTION_CHANGE

Bug: 394398852
Change-Id: I9ec62a8a51c51525edde39c2b09dbf759f6e2c1c
Flag: EXEMPT adding metrics
Test: m com.android.btservices
Test: m statsd_testdrive
Test: m statsd_testdrive -terse 390