Add postDebugTask to debugger launch.json

[WebFreak001]

There is preLaunchTask already which runs a task right before debugging, it would be cool also having a postDebugTask which would run a task when finishing debugging.

Users could then provide a custom start server and stop server task for example.

[weinand]

duplicate of #2405

[newbrain]

Hi,
are you sure it's a duplicate?
The postDebug task should not run once the debugger is started, but rather when it's ended (i.e. when the "Stop" red sqare icon is clicked).
The idea behind the proposal, that I originally sent to the native gdb extension, is to have a clean up task that can, e.g., stop debug servers.

[weinand]

@newbrain you are right.

[MeirionHughes]

Something like this would make clean up after transpiling (for debugging) a bit easier.