feat: support SCIM protocol (#2393)

* 111

* feat: support scim/Users GET and POST request

* feat: support scim/Users DELETE/PATCH/PUT request

* feat: better support scim/Users PATCH request

* feat: fix scim/Users logic

* feat: gofumpt

* feat: fix bug in scim/Users

* feat: fix typo

---------

Co-authored-by: hsluoyz <hsluoyz@qq.com>

controllers/scim.go

@@ -0,0 +1,27 @@
+// Copyright 2023 The Casdoor Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package controllers
+
+import (
+	"strings"
+
+	"github.com/casdoor/casdoor/scim"
+)
+
+func (c *RootController) HandleScim() {
+	path := c.Ctx.Request.URL.Path
+	c.Ctx.Request.URL.Path = strings.TrimPrefix(path, "/scim")
+	scim.Server.ServeHTTP(c.Ctx.ResponseWriter, c.Ctx.Request)
+}