Camera: Dump stack traces at cameraserver watchdog

Before cameraserver watchdog, trigger CameraServiceProxy to dump the
client, cameraserver, and HAL processes stack traces.

Test: Camera CTS; manually force a camera close watchdog
Flag: EXEMPT bugfix
Bug: 392953059
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:4c2f2a6f89180f833b224b1e9558d6581ee54b84)
Merged-In: I22aae54f7308ef4d2f82dd5685406585ead5e33b
Change-Id: I22aae54f7308ef4d2f82dd5685406585ead5e33b