Deprecate libmetricslogger

There's no more usage of libmetricslogger.

Bug: 147777989
Test: compiles and confirmed that there's no usage of it
Merged-In: Ie990f7f1651b7717f21553481dc8635a01993777
Change-Id: Ie990f7f1651b7717f21553481dc8635a01993777
5 files changed