simpleperf: Support compressing ETM data

$ ./simpleperf record -e cs-etm --duration 1 -a -z
simpleperf I cmd_record.cpp:900] Aux data traced: 41,942,880
simpleperf I cmd_record.cpp:892] Record compressed: 23.90 MB (original 103.19 MB, ratio 4.3)

Bug: 343557442
Test: run simpleperf_unit_test
Change-Id: I60b7fc42802312d7049e0db4f68263a73b2b81e1
6 files changed