Reduced redundant metrics logging

If the state changed events does not really contain the change,
do not log it. This can reduce the logging size significantly.
Also separated IMS outgoing and incoming call logging.

Test: runtest -x frameworks/opt/telephony/tests/telephonytests/src/
com/android/internal/telephony/metrics/TelephonyMetricsTest.java

bug: 32537099
Change-Id: I824ffebd45ef6a4c4a6ca8a5ad50b35a20748b07