Support storing SHA256 checksum for files in soong_zip

Add a -sha256 argument to soong_zip that computes SHA256 checksum for
each file and stores the value in file header. The SHA information can
then be used by downstream systems that use content addressing.

Bug: 259513199
Test: zip_test.go
Test: soong_zip -o test.zip -D test_dir -sha256
Change-Id: I20e9f424bd0a4604f0dc7cc77bd65f10eb49a163