add fabric8 analytics feature to jbosstools and devstudio (optional feature, new Central connector)

Once authentication (to access Fabric8 Analytics API) is fixed we can add this to JBoss Tools and devstudio. cc: gbatra

Assuming we also want to create a Central connector to advertise this optional feature.

In future we could also consider adding a Marketplace connector (separate from JBT/devstudio), if that's desired. cc: manderse@redhat.com adisakala_jira

Sources: https://github.com/fabric8-analytics/fabric8-analytics-devstudio-plugin

Affected:

• https://github.com/jbdevstudio/jbdevstudio-product (category.xml, feature.xml)
• https://github.com/jbosstools/jbosstools-build-sites (category.xml)
• https://github.com/jbosstools/jbosstools-discovery (plugin.xml x 2, plus new icon if applicable?)