Add Support for Nexus IQ

Sonatype Nexus IQ includes a Component Details API that can accept basic metadata (GAV, SHA-1, etc) and return a list of security issues. The components being queried on do not need to be in a Nexus repository - IQ acts as an intermediary by making a request to Sonatype Data Services and returns the result.

For orgs using IQ, this would be preferred to using Dependency-Check as an internal scanner. If an IQ server is specified, this should disable the Dependency-Check scanner (and possibly the NPM Audit scanner) and all scans should be performed by a NexusIqScanner implementation for increased accuracy.

Refer to: https://help.sonatype.com/iqserver/rest-apis/component-details-api---v2

Todo:
Investigate vulnerabilities not reported by OSVDB/VulnDB or NVD. I believe they have their own Sonatype vuln identifier as well. Need to confirm.