Move dumpStackTraces to a helper

Move dumpStackTraces and its related functions to a new helper class,
this is a noop change.

Bug: 272292150
Test: Tested on a device (via an ANR)
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:7123bec4a5d15b72cd523c95607f137bdd661d05)
Merged-In: I419cc757bbceed49828a10289543b22f312cfe7a
Change-Id: I419cc757bbceed49828a10289543b22f312cfe7a