startop: Rewrite app startup runner to use new python run_app_with_prefetch.

Test: pytest app_startup_runner_test.py
Test: pytest lib/args_utils_test.py
Test: pytest lib/data_frame_test.py
Test: ./app_startup_runner.py  --package com.google.android.music --readahead fadvise --readahead cold   --inodes textcache  --output output.txt -d -lc 3
Change-Id: Ide9abe4ff3d7179e6830a7866b0eb90cc67d8e40
Bug: 137216480