src/vs/workbench/contrib/debug/browser/rawDebugSession.ts/RawDebugSession/initialize
class RawDebugSession:	async initialize(args: DebugProtocol.InitializeRequestArguments): Promise<DebugProtocol.InitializeResponse | undefined> {
		const response = await this.send('initialize', args);
		if (response) {
			this.mergeCapabilities(response.body);
		}

		return response;
	}