SBOM - Add the `namespace`, `pref` and `qualifiers` to the purl

[ErniGH]

Changelog: Fix: Describe here your pull request Docs: https://github.com/conan-io/docs/pull/XXXX

Add the pref and qualifiers to the purl Add namespace support to the purl

close: https://github.com/conan-io/conan/issues/18971

[memsharded]

There is a ticket in the purl-spec org to check with the experts there: https://github.com/package-url/purl-spec/issues/705