Update config for RPC communication

[ishantiw]

Description

Update the Configuration to improve and handle multiple mode of RPC communication.

// Current Config
rpc: {
	mode: ipc | ws,
 	enable: true,
	port: 8080,
}

// In Bus constructor
// Problem: It starts IPC server anyways even if ipc mode is not chosen
if (this.config.rpc.enable) {
            this._ipcServer = new IPCServer({
                socketsDir: this.config.socketsPath.root,
                name: 'bus',
            });
  }

if (this.config.rpc.enable && this.config.rpc.mode === 'ws') {
			this._wsServer = new WSServer({
				path: '/ws',
				port: config.rpc.port,
				host: config.rpc.host,
				logger: this.logger,
			});
		}

// New Config
rpc: {
	ipc: { path: ‘tmp/external/’},
 	ws: { port: 8080 },
        modes: [‘ipc’, ‘ws’]
}

// In Bus constructor
if (this.config.rpc.ipc) {
            this._ipcServer = new IPCServer({
                socketsDir: this.config.socketsPath.root,
                name: 'bus',
            });
  }

if (this.config.rpc.ws) {
            this._wsServer = new WSServer({
                path: '/ws',
                port: config.rpc.port,
                host: config.rpc.host,
                logger: this.logger,
            });
  }

Acceptance Criteria

• Config related tests should pass
• Should be able to run current ws, ipc modes concurrently

Additional Information

Related #6612