Add decompression capability to apexd for compressed APEX

Apexd can now decompress a compressed APEX. We still haven't integrated
this new ability with the boot flow yet. It will be done in next CL.

Bug: 172911820
Test: atest ApexFileTest#Decompress
Test: atest ApexFileTest#DecompressWithoutProperSuffix

Change-Id: If8e6f7de86cbefecdb1e1ed955b39fc3f58521e2
5 files changed