Restore the resolverTest plugin. This will allow us to run the test plugin and try out Resolver using our mock data access layers. Eventually this could be expanded to support multiple different data access layers. It could even be expanded to allow us to control the data access layer via the browser. Another option: we could export the APIs from the server and use those in this test plugin.

We eventually expect other plugins to use Resolver. This test plugin could allow us to test Resolver via the FTR (separately of the Security Solution.)

This would also be useful for writing tests than use the FTR but which are essentially unit tests. For example: taking screenshots, using the mouse to zoom/pan.

Start using: `yarn start --plugin-path x-pack/test/plugin_functional/plugins/resolver_test/`