Adding product status to Product table.
Product status can be one of the following:
1. UNSAFE (One of the test results is positive)
2. QUARANTINED (Not tested yet, all tests not done)
3. AVAILABLE (Tested and ready for use. Does not include whether expired or not)
4. ISSUED (when issued for some request)
5. DISCARDED (should be discarded manually)
6. OTHER (for later use)