Refactor GraphicsStatsService for updateability

Move GraphicsStatsService to android.graphics package.
Move GraphicsStatsService JNI from libservices.core to
libandroid_runtime.
Declare GraphicsStatsService ctor as the only @SystemApi.
Remove MemoryFile usage from GraphicsStatsService, but use
SharedMemory and other SDK APIs instead. This is done to
avoid using unstable API MemoryFile.getFileDescriptor.
Propose new SharedMemory.getFdDup API for next release, which
is hidden for now.
Refactor statsd puller to avoid proto serialization by moving
data directly into AStatsEventList.
"libprotoutil" is added as a static dependancy to libhwui, which
should be fine because its implementation does not link anything.

Bug: 146353313
Test: Ran "adb shell cmd stats pull-source 10068"
Test: Passed unit tests and GraphicsStatsValidationTest CTS
Change-Id: If16c5addbd519cba33e03bd84ac312595032e0e1