feat(perms): 添加ApplicationPermission Model 和 API（包含ViewSet和RelationViewSet)

apps/perms/models/application_permission.py

@@ -0,0 +1,38 @@
+# coding: utf-8
+#
+
+from django.db import models
+from django.utils.translation import ugettext_lazy as _
+
+from common.utils import lazyproperty
+from .base import BasePermission
+
+__all__ = [
+    'ApplicationPermission',
+]
+
+
+class ApplicationPermission(BasePermission):
+    applications = models.ManyToManyField('applications.Application', related_name='granted_by_permissions', blank=True, verbose_name=_("Application"))
+    system_users = models.ManyToManyField('assets.SystemUser', related_name='granted_by_application_permissions', verbose_name=_("System user"))
+
+    class Meta:
+        unique_together = [('org_id', 'name')]
+        verbose_name = _('Application permission')
+        ordering = ('name',)
+
+    @lazyproperty
+    def users_amount(self):
+        return self.users.count()
+
+    @lazyproperty
+    def user_groups_amount(self):
+        return self.user_groups.count()
+
+    @lazyproperty
+    def applications_amount(self):
+        return self.applications.count()
+
+    @lazyproperty
+    def system_users_amount(self):
+        return self.system_users.count()