perf: 支持slack通知和认证 (#12193)

* perf: 支持slack通知和认证

* perf: 生成迁移文件

* perf: 优化获取access_token逻辑

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Co-authored-by: jiangweidong <weidong.jiang@fit2cloud.com>

apps/settings/api/settings.py

@@ -39,6 +39,7 @@ class SettingsApi(generics.RetrieveUpdateAPIView):
         'wecom': serializers.WeComSettingSerializer,
         'dingtalk': serializers.DingTalkSettingSerializer,
         'feishu': serializers.FeiShuSettingSerializer,
+        'slack': serializers.SlackSettingSerializer,
         'auth': serializers.AuthSettingSerializer,
         'oidc': serializers.OIDCSettingSerializer,
         'keycloak': serializers.KeycloakSettingSerializer,