dumpstate: move dump_traces to Dumpstate

Prefactoring to handle user consent denial sooner.

BUG: 128270426

Test: adb shell
/data/nativetest64/dumpstate_smoke_test/dumpstate_smoke_test &&
adb shell /data/nativetest64/dumpstate_test/dumpstate_test

Change-Id: Ifbace4391d22901480e41d3125d8a89508ebd52d