Remove redundant package-urls from VCIO

Currently, we store duplicated package-urls because of the way they are different structurally but similar when constructed as a purl whole, for example:

1st Scenario:

Purl A-
type-"pypi", namespace- "", name - "foo/bar"

Purl B-
type-"pypi", namespace-"foo", name - "bar"

They are structurally different, but their purl will be identical i.e "pkg:pypi/foo/bar"

2nd Scenario:

https://github.com/nexB/vulnerablecode/wiki/WeeklyMeetings#meeting-on-tuesday-2023-10-24-at-1600-utc discussed here in the weekly meeting

The solution for 2nd scenario was discussed in the weekly meeting, but what should be done for 1st scenario ?