Show toString() values in hover tooltips #364

Similar to #315, it would be very useful to show the .toString of an object in the hover tooltip.

For example, in vanilla Eclipse debugger:

vs. in VS Code, you also have to expand the elements to see what's inside:

Steps To Reproduce

1. set breakpoint
2. hover over local variable

Current Result

See object explorer tooltip

Expected Result

Also see a useful .toString, as in Eclipse