MediaMetric: set maximum properties as 128.

Currently, the maximum properties count is 50, which is too small in
some and cause some metrics lost. In this CL, 1) make the limitation to
128 to avoid losing metrics, 2) record the rejected properties count and
dump it in case 128 is too small in the future.

Bug: 273604966
Test: repo steps in bug
Test: atest MediaMetricsTest
Change-Id: I134280c3d95c28c04fe8c95c597fd0447e685889