feat(cli): Add typed client to a generated app

[daffl]

This pull request adds a Feathers client module to the generated application. This means you can import your API in your client side React, VueJS etc. project and instantiate a client specifically for it. If you are using TypeScript it will use the service names and schemas declared on the server.

import io from 'socket.io-client'
import socketio from '@feathersjs/socketio-client'
import authentication from '@feathersjs/authentication-client'

import { createClient } from 'my-api'

const client = createClient(socketio(io))
  .configure(authentication)

const page = await client.service('users').find({
 query: {} // Get autocompletion for all query schema props
})

page.data // Will be UserResult[] type

[marshallswain]