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/tier/tier_admin.rs

@@ -0,0 +1,42 @@
+#![allow(unused_imports)]
+// 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.
+#![allow(unused_variables)]
+#![allow(unused_mut)]
+#![allow(unused_assignments)]
+#![allow(unused_must_use)]
+#![allow(clippy::all)]
+
+use serde::{Deserialize, Serialize};
+
+#[derive(Serialize, Deserialize, Default, Debug, Clone)]
+#[serde(default)]
+pub struct TierCreds {
+    #[serde(rename = "accessKey")]
+    pub access_key: String,
+    #[serde(rename = "secretKey")]
+    pub secret_key: String,
+
+    #[serde(rename = "awsRole")]
+    pub aws_role: bool,
+    #[serde(rename = "awsRoleWebIdentityTokenFile")]
+    pub aws_role_web_identity_token_file: String,
+    #[serde(rename = "awsRoleArn")]
+    pub aws_role_arn: String,
+
+    //azsp: ServicePrincipalAuth,
+
+    //#[serde(rename = "credsJson")]
+    pub creds_json: Vec<u8>,
+}