[SfStats] Implement global atom puller for SfStats

Bug: 119885568
Bug: 136597024
Test: adb shell cmd stats pull-source 10062
Test: statsd_testdrive 10062
Test: atest statsd_test
Change-Id: Ib113066faf67f6abba6cd377aaf1fe17cf16d4d0
5 files changed