feat(plugins/auth): move user functions to seperate folder

Author: tks18

plugins/auth/index.ts

@@ -1,7 +1,7 @@
-import user from './user';
+import { user } from './methods';
 
 export * from './helpers';
-export * from './user';
+export * from './methods/user';
 export default {
   user,
 };

plugins/auth/methods/index.ts

@@ -0,0 +1,2 @@
+export { default as user } from './user';
+export { default as credentials } from './credentials';