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/madmin/src/utils.rs

@@ -0,0 +1,51 @@
+// 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 std::time::Duration;
+
+pub fn parse_duration(s: &str) -> Result<Duration, String> {
+    // Implement your own duration parsing logic here
+    // For example, you could use the humantime crate or a custom parser
+    humantime::parse_duration(s).map_err(|e| e.to_string())
+}
+
+#[cfg(test)]
+mod test {
+    use std::time::Duration;
+
+    use super::parse_duration;
+
+    #[test]
+    fn test_parse_dur() {
+        let s = String::from("3s");
+        let dur = parse_duration(&s);
+        println!("{dur:?}");
+        assert_eq!(Ok(Duration::from_secs(3)), dur);
+
+        let s = String::from("3ms");
+        let dur = parse_duration(&s);
+        println!("{dur:?}");
+        assert_eq!(Ok(Duration::from_millis(3)), dur);
+
+        let s = String::from("3m");
+        let dur = parse_duration(&s);
+        println!("{dur:?}");
+        assert_eq!(Ok(Duration::from_secs(3 * 60)), dur);
+
+        let s = String::from("3h");
+        let dur = parse_duration(&s);
+        println!("{dur:?}");
+        assert_eq!(Ok(Duration::from_secs(3 * 60 * 60)), dur);
+    }
+}