Allow access to outbound foreignkey values in url_pattern attribute of assets

[RFSH]

As the title suggests. We're currently only passing the table row values to the renderTemplate function, but that is not enough and we should allow data-modelers to access the outbound foreign keys as well.

The only challenge that I can see for doing this is how to pass the foreign key values to the hatrac.js. We're currently only passing the row value. We should extend the APIs to pass more information. The error handling and the rest of the functions that exist around this functionality should still remain the same, and we most probably won't need to augment them to support this.