Add support for Amazon ALAS datasources for Amazon Linux 1, 2 & 2023

### Current Behavior

At present, when uploading SBOMs for an Amazon Linux 2023 based AMI, the AMI is reported as "not vulnerable" because the SBOM contains packages prefixed with `amzn` (or similar). The end result is that _no_ security vulnerabilities are reported by Dependency Track on these AMIs - even though Amazon's own AWS Inspector or the Amazon Linux Security Center reports multiple issues.

### Proposed Behavior

Include Amazon Linux Security Center vulnerability feeds as another data source. They apply specifically for Amazon Linux packages so it should not interfere with other data source providers.

Example would be to incorporate the output of [Amazon Linux Security Center](https://alas.aws.amazon.com/) via RSS feed or similar.

### 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