License API uses SPDX ID, but License Groups API uses License UUID

### Current Behavior

`​/v1​/licenseGroup​/{uuid}​/license​/{licenseUuid}` vs `/v1/license/{licenseId}`

### Proposed Behavior

Since SPDX ID is already unique it should be used as identifier instead of UUID

### 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