Queue status API

I searched for already open enhancement request but I didn't find anything related to queue of uploaded bom.

Our problem is that sometimes DependencyTrack slowing down and we esperiencing wrong results from our CI: developers updates dependencies in their projects but DT still address vulnerabilities of "previous version". It would be nice to have an API to establish queue status of processing bom.

### Current Behavior:
- Parse log for token for each bom upload
- Call /v1/bom/token/{token} and checks it content (processing true/false)

### Proposed Behavior:
An API with status of queue: number of bom in queue and upload timestamp at least.