Add socket listener to statsd. And remove Davey atom.

+ The socket listener is behind a flag. It's disabled until we get sepolicy changes in.
+ Data parsing code is from logd, because we use the same format.

+ Removed Davey from JankTracker because it violates our new sepolicy

Test: manually
Bug: 78239479

Change-Id: Ib17729fbc362cdb13385f780e2d636a95adf9bc3