[pm] use AtomicFile for stub package decompression

AtomicFile handles file stream flush and sync, and uses
rename-into-space to avoid file corruption.

Notice that this is currently only used by Chrome.apk,
WebViewGoogle.apk, TrichromeLibrary.apk on first boot.

BUG: 205894668
Test: manual
Change-Id: Ia828856f873fc286af045e7ce2049c8060d14811