reactor&remove: 重构applications模块 & 移除applications、perms中已不再使用的模块 (#5374)

* reactor: 重构applications模块 & 删除applications、perms中已不再使用的模块

 * reactor: 1. 针对application.attrs字段的view-serializer映射逻辑，采用DynamicMapping的方案重写;
 * reactor: 2. 删除applications和perms模块中已不再使用的database-app/k8s-app/remote-app模块;

* reactor: 添加迁移文件(删除perms/databaseperrmission/remoteapppermission/k8sapppermission)

* reactor: 修改细节

Co-authored-by: Bai <bugatti_it@163.com>

apps/perms/mixins.py

@@ -1,22 +0,0 @@
-# ~*~ coding: utf-8 ~*~
-#
-
-from orgs.utils import set_to_root_org
-
-__all__ = [
-    'ChangeOrgIfNeedMixin',
-]
-
-
-class ChangeOrgIfNeedMixin(object):
-
-    @staticmethod
-    def change_org_if_need(request, kwargs):
-        if request.user.is_authenticated and request.user.is_superuser \
-                or request.user.is_app \
-                or kwargs.get('pk') is None:
-            set_to_root_org()
-
-    def get(self, request, *args, **kwargs):
-        self.change_org_if_need(request, kwargs)
-        return super().get(request, *args, **kwargs)