refactor: Restructure project layout and clean up dependencies (#30)

This commit introduces a significant reorganization of the project structure to improve maintainability and clarity.

Key changes include:
- Adjusted the directory layout for a more logical module organization.
- Removed unused crate dependencies, reducing the overall project size and potentially speeding up build times.
- Updated import paths and configuration files to reflect the structural changes.

crates/ecstore/src/client/admin_handler_utils.rs

@@ -0,0 +1,47 @@
+// Copyright 2024 RustFS Team
+//
+// 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.
+
+use http::status::StatusCode;
+use std::fmt::{self, Display, Formatter};
+
+#[derive(Default, thiserror::Error, Debug, Clone, PartialEq)]
+pub struct AdminError {
+    pub code: String,
+    pub message: String,
+    pub status_code: StatusCode,
+}
+
+impl Display for AdminError {
+    fn fmt(&self, f: &mut Formatter) -> fmt::Result {
+        write!(f, "{}", self.message)
+    }
+}
+
+impl AdminError {
+    pub fn new(code: &str, message: &str, status_code: StatusCode) -> Self {
+        Self {
+            code: code.to_string(),
+            message: message.to_string(),
+            status_code,
+        }
+    }
+
+    pub fn msg(message: &str) -> Self {
+        Self {
+            code: "InternalError".to_string(),
+            message: message.to_string(),
+            status_code: StatusCode::INTERNAL_SERVER_ERROR,
+        }
+    }
+}