Evaluate grype-db as source for vulnerability database

### Current Behavior

We're aiming to build a mechanism to assemble and distribute a vulnerability database tailored to Dependency-Track's needs.

Similar efforts exist already. It would be good to leverage what is already there, rather than reinventing the wheel.

The goals for our own database are defined here: https://docs.google.com/document/d/1DVV4ik7NGOBc6u-fdPlPVKoplNmSpzDT6iC4FJAFYi0/edit?tab=t.0#heading=h.w22q0gsagz1c

### Proposed Behavior

Evaluate if and how grype-db (https://github.com/anchore/grype-db) can be leveraged.

### Checklist

- [x] I have read and understand the [contributing guidelines](https://github.com/DependencyTrack/dependency-track/blob/master/CONTRIBUTING.md#filing-issues)
- [x] I have checked the [existing issues](https://github.com/DependencyTrack/dependency-track/issues) for whether this enhancement was already requested