[TeX] Add histogram metric for full screen magnification interval of triple tap gesture

Using 25 uniform bins between 0 and 250. A histogram can only be used to record one type of data. Separate the two intervals into two distinct histograms, as this will provide a clearer understanding of how to define the intervals for the adaptive triple tap.

Bug: 364466679
Test: build
Test: manual
Test: atest FullScreenMagnificationGestureHandlerTest
Flag: EXEMPT log only update
Change-Id: I09803b483e47b4a23301f854d628731036659da4