Show inline values in source when stepping through code

[weinand]

1. in the debug protocol add a scope boundary (start, end position) to the scope object.
2. implement this in node-debug2.
3. VS Code starts to use that information to fix the hover experience by only showing a hover when inside the scope boundaries.
4. node.debug2 and (node-debug) implement the one line 'preview' for objects and arrays. This is not a new protocol request but just improves what's get returned as the valueattribute in a Variables request for objects and arrays.
5. VS Code implements the 'show inline values' feature as outlined in Debug: investigate how to present inline values in source when stepping through code #12256

[isidorn]

Assigning to @roblourens until this is implemented in the adapters. Once that is done assign back to me and I can pick it up in the UI

[weinand]

I will create an issue for Rob in his repository.

[roblourens]

I added the scope locations to node-debug2. Will be in the next Insiders

[isidorn]

Once we have this feature we should use it to market our new node2 debugger. It looks fancy so it can draw people to swtich to node2.

[weinand]

We will swap 'node' and 'node2' as soon as the node version used in electron supports CDP. Without that extension host debugging does not work in node2.

[isidorn]

And when we do the switch we can use this feature as one of the user visible improvements

[isidorn]

First version of this has been pushed to master.
If a debug adapter is providing scope ranges those will be used, otherwise we show inlinve values from lineNumber 0 to the current lineNumber of the stack frame