CLI start working without rnc/cli-server-api

When decoupling the community-cli-plugin from the
@react-native-community/cli-server-api (#45311), a middleware stub was
created to allow a runtime stub to be used in this case. This middleware
should be used so as not to break when the optional cli-server-api
dependency isn't present.

Changelog: [General][Fix] - Fix npm react-native start when
cli-server-api isn't installed

Testing: Forced a runtime exception simulating the package not being
dependent and was able to build rn-tester.

packages/community-cli-plugin/src/commands/start/runServer.js

@@ -22,7 +22,7 @@ import attachKeyHandlers from './attachKeyHandlers';
 import {
   createDevServerMiddleware,
   indexPageMiddleware,
-} from '@react-native-community/cli-server-api';
+} from './middleware';
 import {createDevMiddleware} from '@react-native/dev-middleware';
 import chalk from 'chalk';
 import Metro from 'metro';