Send variable details so variable window doesn't collapse them while stepping

[brettcannon]

microsoft/vscode-python#645

[karthiknadig]

ptvsd has no information about the state of the variable window. There is no debug adapter message support for such a thing. This does not feel like a issue that can be fixed on the python side of things.

[fabioz]

@karthiknadig from microsoft/vscode#32199 (comment), it seems that this is really from ptvsd... I haven't checked, but I know ptvsd does some translations back and forth from the pydevd structure to what the debug adapter expects -- is it possible that new ids are being generated instead of keeping an existing id in place for the frame or variables?

[karthiknadig]

@fabioz That is a good suggestion. We do update the ids for frames and variables. That is something we can fix.

[karthiknadig]

I am converting this to a tacking bug. We need to make two separate set of changes, to get this working correctly.