enhance notification system

### Current Behavior

We use the application with many projects, some of which are based on a similar technology stack (microservices). Each service is mapped as a separate project - sometimes with different versions - in dependec track. To this end, we have implemented a dependency for the integration of jira via webhook notifcations and jira automations. Now we have the problem that the notifcations arrive quasi parallel in jira and thus the depulization does not take effect.

### Proposed Behavior

Please extend the system so that the webhook notifications are processed in a queue to prevent race conditions in the integration of target systems Like jira.

Alternatively, a corresponding plugin API, which enables the implementation of plugins by third parties, would be useful.

### 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