refactor(web): registering plugins and lazy loading

[reslear]

1. Refactor registering plugins by spec doc
   https://capacitorjs.com/docs/updating/plugins/3-0#registering-plugins

2. move constructor init to method hook init for manually controlling loading on document ready

   example for vue:

   import { defineComponent, onMounted } from 'vue'
   import { GoogleAuth } from '@reslear/capacitor-google-auth'
   
   export default defineComponent({
     setup() {
       onMounted(() => {
         GoogleAuth.init()
       })
       
       const logIn = async () => {
         const response = await GoogleAuth.signIn()
         console.log(response)
       }
       
       return {
         logIn
       }
     }
   })