Add support to provide app its own ANR stack trace

...If it was killed due to ANR.

Also add support to set a cookie which could be
included into the app kill reason.

Bug: 148413462
Test: atest ApplicationExitInfoTest
Test: atest CtsAppExitTestCases:ActivityManagerAppExitInfoTest
Change-Id: I79d9955d8f5c5f42074f0e1567119b41fc486d50