refactor: optimize plugins for angular treeshaking

BREAKING CHANGE: You can remove the plugin import from the app.module.ts because of the changed Inject decorator

src/@ionic-native/plugins/pin-check/index.ts

@@ -31,7 +31,9 @@ import { Injectable } from '@angular/core';
   repo: 'https://github.com/shangyilim/cordova-plugin-pincheck',
   platforms: ['Android', 'iOS']
 })
-@Injectable()
+@Injectable({
+  providedIn: 'root'
+})
 export class PinCheck extends IonicNativePlugin {
   /**
    *  check whether pin/keyguard or passcode is setup