feature: support kms && encryt (#573)

* feat(kms): implement key management service with local and vault backends

Signed-off-by: junxiang Mu <1948535941@qq.com>

* feat(kms): enhance security with zeroize for sensitive data and improve key management

Signed-off-by: junxiang Mu <1948535941@qq.com>

* remove Hashi word

Signed-off-by: junxiang Mu <1948535941@qq.com>

* refactor: remove unused request structs from kms handlers

Signed-off-by: junxiang Mu <1948535941@qq.com>

---------

Signed-off-by: junxiang Mu <1948535941@qq.com>

crates/kms/src/encryption/mod.rs

@@ -0,0 +1,20 @@
+// 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.
+
+//! Object encryption service implementation
+
+mod ciphers;
+pub mod service;
+
+pub use service::ObjectEncryptionService;