simpleperf: update debug_unwind_reporter.py.

Update debug_unwind_reporter.py to show report file generated by
debug-unwind cmd:
1. Add --summary to show summary tables instead of details.
2. Add filters to filter samples.

Also add corresponding tests.

Bug: 181075274
Test: run test.py TestDebugUnwind*.

Change-Id: Ib4a0cc4a018aac4b2d4e94704f16114549caddfd
6 files changed