feat: show local, class and global variable values that are currently on the stack

[lcottercertinia]

description

I would like to be able to see the currently local, class and global variable that are on the stack for a given node at that particular point in the execution.

Describe the solution you'd like

Show variable values on the timeline maybe via tooltip. Show on calltree within context e.g local global.

Possibly this could be extended to work with the vscode debugger with step over etc. (but would be more work) Add debugger like feature in a side panel so the code can be focused as this panel is navigated. Will need to keep track of which variables are in scope e.g class level are visible from method.