simpleperf: add --show-execution-type in report-sample cmd.

When --show-execution-type is used, a new field execution_type is
added in CallChainEntry to show the method type. When used, it can
increase up to 20% output size.

Bug: 175163225
Test: run simpleperf_unit_test
Change-Id: I4724059e26a0250ef52bf89ce8d81434a7893bbd
7 files changed