Add Installd IPC to compute the SHA256 of a seconday dex file.

(cherry picked from commit 753dc71734927f86c277991be9326cb9a82202b1)

Bug: 63927552
Test: Exercised manually. Added unit tests in installd_service_test.

Merged-In: If9df7a88f3a3039aab69ed5f200d14cb19794cb3
Change-Id: If9df7a88f3a3039aab69ed5f200d14cb19794cb3
9 files changed