Add Wiki Docs for debug w/ VS Code + STM32CubeCLT + cortex-debug extension

[bryceschober]

Is your feature request/improvement related to a problem? Please describe.

There are no documented suggestions for debugging with VS Code + STM32CubeCLT + cortex-debug extension.

Describe the solution you'd like

I figured out how to make it work, so I'd like to share. I wrote this page on the cortex-debug extension's wiki because it was publicly editable: https://github.com/Marus/cortex-debug/wiki/STM32CubeCLT-Specific-Configuration-(using-ST%E2%80%90Link)

I think it would be very helpful to add to it as a new "Visual Studio Code and STM32CubeCLT and cortex-debug extension" section on your https://github.com/stm32duino/Arduino_Core_STM32/wiki/How-to-debug page.