Move some files into models' sub packages (#20262)

* Move some files into models' sub packages

* Move functions

* merge main branch

* Fix check

* fix check

* Fix some tests

* Fix lint

* Fix lint

* Revert lint changes

* Fix error comments

* Fix lint

Co-authored-by: 6543 <6543@obermui.de>

models/user/user_update.go

@@ -0,0 +1,16 @@
+// Copyright 2022 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package user
+
+import (
+	"context"
+
+	"code.gitea.io/gitea/models/db"
+)
+
+func IncrUserRepoNum(ctx context.Context, userID int64) error {
+	_, err := db.GetEngine(ctx).Incr("num_repos").ID(userID).Update(new(User))
+	return err
+}