Feat: add cortex-debug

[mrsch]

Related to #224

First try to get the cortex-debug extension running.
I had to make a change to dap--parser-read to skip some additional log outputs from cortex-debug. I don't know if this works with the other dap providers since I don't use any other.

I was able to successfully debug with the following config in launch.json:

{
      "name": "Debug nrf52832",
      "cwd": "${workspaceFolder}",
      "executable": "./build/firmware.elf",
      "request": "launch",
      "type": "cortex-debug",
      "device": "nRF52832_xxAA",
      "servertype": "jlink",
      "runToMain": true
    }