Add a inPausedDebugMode flag

[fabiospampinato]

There's already an inDebugMode flag that can be used in keystrokes' when clauses. It would be useful to have an inPausedDebugMode as well.

My use case: I've made my workbench.action.debug.continue shortcut be cmd+\, which is what Chrome uses, but that's also the same shortcut I use for splitting the editor. Basically without this flag I cannot split editors while debugging.

Having this flag would also partially fix #30810 if ever those when flags will be exposed via the API.

[isidorn]

There is debugState context key. Try it out

[fabiospampinato]

Great!

For future reference: the string to use is debugState == 'stopped'.