Draft: LSP: created command for goto widget definition. Is incomplete

Would be very useful to find a widget by Ctrl+Clicking an id reference to a widget (like in a property or in a binding). According to the specification, the text editor makes a request where the only useful information is the document uri and the position (line and column) of the reference id. I think the way to get the string of the id is to parse an ident token from that position but im not sure if that is the solution (will try that). The response should have the range from the widget's class to the id if using LocationLink or just the id if using Location.