Adding support for a new debugger

Generate a sample by running the yo @theia/plugin command. When prompted, confirm the choices for Backend plug-in, Samples, and then Debugger sample. This creates a project and a ready-to-use plug-in, which can be deployed.

Replace the mock implementation of the debug adapter in the src/vscode-mockDebug.ts and src/vscode-mockRuntime.ts files with code that interacts with a real debugger or runtime.

Build the plug-in by running the yarn command in the root of the project.

Deploy the Che-Theia plug-in via the plugin-in registry.