update name to username in User model

@@ -13,7 +13,7 @@ model User {
   avatarUrl      String?   @default("")
   email          String    @unique
   password       String
-  name           String
+  username       String
   phoneNum       String    @default("") @unique
   emailSecret    String?   @default("")
   phoneSecret    String?   @default("")

 type Mutation {
   createAccount(
-    name: String!
+    username: String!
     email: String!
     password: String!
     bio: String
     avatarUrl: String
-    phoneNum: String
+    phoneNum: String!
   ): AuthPayload!
 }

 type Mutation {
   editProfile(
     email: String!
-    name: String
+    username: String
     bio: String
     avatarUrl: String
     phoneNum: String

 type User {
   id: ID!
   avatarUrl: String
-  name: String!
+  username: String!
   email: String!
   password: String!
   emailSecret: String