dap: add netcoredbg DAP server

Héctor Mesa Jiménezrequested to merge
hectorm/kate:dap-netcoredbg into master

netcoredbg (https://github.com/Samsung/netcoredbg) is a standalone debug server for .NET Core which supports GDB/MI and DAP protocols.

This patch adds a basic configuration for netcoredbg to dap/servers.json

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