Statsd CTS tests for proc state

Tests the following proc states in statsd:
Foreground service
Foreground
Background
Top
Top sleeping
Cached

These tests do not use the instramentation harness, which has
historically interfered with the proc state of the app.

Change-Id: I2b9a4bf4d165e8d951b93ba19745c81027cf02a9
Fixes: 71633752
Test: run cts-dev -m CtsStatsdHostTestCases -t android.cts.statsd.ProcStateAtomTests
10 files changed