Move android_bitmap_metric to SysUI repo.

Setting up a directory for any future V2 perfetto metrics in SysUI.

Bug: 436212248
Test: atest SysUiMetricsV2Test (ATI run with the moved metric:
http://ab/I67600010432378805)
Flag: EXEMPT added new sysui metrics

Change-Id: Ic22421f1edb70d44db3a1a902df23c950d029db0