Login for every new window is annoying

### Current Behavior

Currently each time I open a link to a deptrack project (from my CI), I have to login again.
This behavior differs slightly on the browser: In FF it is required for a new tab. For chrome it is only required when all previous tabs for deptrack are closed. Some googling implies Safari works as FF.

### Proposed Behavior

The session should remain for the duration of its validity as it does for most websites.
So either by utilizing the localStorage (instead of sessionStorage) or setting a cookie (from JS).

### 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