Add config for Native Binder Stats

Add Settings.Global.NATIVE_BINDER_STATS and a ContentObserver which
listens for changes. Define the parameters for sharding that will be
used by libbinder.

This is implemented similarly to the existing BINDER_CALLS_STATS

Bug: 299356196
Test: FrameworksCoreTests:com.android.internal.os.NativeBinderStatsTest
Flag: EXEMPT this change is adding flags using the legacy path
Change-Id: I6baf7971fb98777acc7df3c02cf1e2d5e4925cd5