Add advisory v2

[TG1999]

• Reference: VCIO-next: Design new Advisory -> Package -> Vulnerability models relationhips #1393
• VCIO-next: Advisory model migration Batch 1 #1877
• Add V2Advisory Model.
• V2Advisory Model should have relationships between other models like aliases, affected packages, references, severities and weaknesses.
• V2AdvisoyModel will have advisory ID. advisory ID will be a natural ID for example Redhat importer will have RHSA, NVD will have CVE, when there is no ID we will create one. For example NPM

[keshav-space]

Thanks @TG1999, looking good so far. Since the new VulnerableCodeBaseImporterPipelineV2 is not trivial we should test it and we also need some tests for new v2 models.