Creation of Sonar Tab Metrics Plugin

This plugin has the following requirements:

1. Plugin will add a new tab called "All" in the resource viewer. Plugin name should be "Sonar Tab Metrics Plugin".

2. This tab should include all the metrics at file level (including these already displayed on other tabs like Source tab for example), not only metrics defined in plugins.

3. Metrics should be organized by domain as done on the Time machine page.

4. As we'll have some space on the tab, it could be interesting to add some information on each metric for the developer to understand it (description, best value, worst value, etc.). But it doesn't have to be done in the first release.