Add configuration page for Debug plugin

Simple configuration menu for DAP.json files.

I basically recreated the LSP plugin config menu since I looked how it was done and wrote things pretty much from word to word 😅 

![image](/uploads/c4aed4efee8be3707efc4eae3aa03048/image.png)

![image](/uploads/ba8ee71a3ebddc8e3135f03e7ea613ef/image.png)

Like with LSP client settings, you have to restart Kate to see the changes to DAP settings.