Vscode debug template for running server with custom config file

[callumforrester]

It would be good to run the server in debug mode with my own config file.

Acceptance Criteria

• There is a new debug config called "Blueapi Server (Custom Config)"
• When I run it I am prompted to enter a path to my config file (see the "Blueapi Controller" configuration for how to do this)
• The server runs using the config provided
• The old config, "Blueapi Server", sticks around as a convenient shortcut