Add integration test for verifying package verification code in SBOM.

The test case calculates package verification code of package product according to the SPDX spec and compare it to the one in SBOM file which should have the same SHA1 hash value. This helps verify the python logic of generating it in SBOM files.

Bug: 293304694
Test: build/soong/tests/sbom_test.sh
Change-Id: I37c96d90a1990fbeb786f1bd4e8dc87102e0f0cd