profcollectd: Process profiles on a detached thread

Processing profile can take a long time, and triggers a system
health report about blocked binder service call. Process the profiles
on a detached thread and allow the binder call to return immediately.

Bug: 170134563
Bug: 171314458
Test: procollectctl process
Change-Id: I858265d1c6f4c2803fd2b1fbf9f38b1ee051901f
2 files changed