Add support to generate fsverity metadata

By setting fsverity.inputs, android_filesystem can now generate
.fsv_meta and BuildManifest.apk. It has been done by Makefile because
Makefile is the only one knowing all installed files. But now
android_filesystem is aware of all artifacts, so we can move fsverity
metadata generation into Soong.

Bug: 330282551
Test: m aosp_cf_system_x86_64 and see output
Change-Id: Iae4dd83eaede960c263bfba537211df4ff4b36bd