Gadgets in the macro browser should display their providers name/URL

Summary

If the same gadget can be consumed from multiple providers, users need to be able to associate the gadget to each providers name/hostname/URL, otherwise users have trouble choosing the gadget they want. See screenshot for example.

This would be an improvement to the UI originally shipped in https://jira.atlassian.com/browse/CONFSERVER-17991

Steps to Reproduce

1. Connect Confluence to Jira.
2. Create a Gadget Feed.
3. Edit a page.
4. Open the macro browser.

Expected Results

Each gadget will show the providers name.

Actual Results

Nothing is written and it appears you have duplicate gadgets

Workaround

Hover over the Gadget URL link to see which provider the gadget is hosted on.