Adding additional reporting to tests and features

Implement MetricsReportLog to generate reportlog.json.
results/latest/report-log-files/StsTestCases.reportlog.json

see json prettified with:
StsTestCases.reportlog.json | python3 -m json.tool | less

Bug: 157920496
Test: run sts
Change-Id: I23d4a50673067b15e26b20dcdbee3dfe585b0331
Merged-In: I23d4a50673067b15e26b20dcdbee3dfe585b0331
3 files changed