Importer Analytics Panel

* [ ] Discuss and finalize list info graphics we want in the Importer Analytics Panel in order to finalize the fields for related models and endpoints
* [ ] Create the Panel UI

This panel focuses on importer performance, advisory ingestion coverage, and cross-validation insights across datasource importers.

#### Draft List:

1. **Advisory Count per Datasource Importer (Horizontal Bar Chart)**
`Total Advisories , Advisories with/without an Affected Package, Advisories with Ghost package`

* Show absence of purl and vers mappings and possible need of Improvers and the perecenatge of ghost packages

2. **Exploit Coverage across Importers**
* Can be viewed across all importers or filtered to a specific datasource.
* Total Advisories , Advisories with/without an Exploit and split between KEV, Metasploit and Exploit DB