refactor(sse): decouple ecstore and harden KMS lifecycle (#5435)

* refactor(sse): decouple encryption from ecstore

* feat(kms): enhance KMS service manager with runtime state and persistence support

* feat(kms): add local key export functionality for SSE-S3 migration tests

* fix(kms): keep local key export narrowly scoped

* fix(sse): validate copy source customer algorithm

---------

Co-authored-by: Zhengchao An <anzhengchao@gmail.com>

crates/ecstore/src/object_api/mod.rs

@@ -84,6 +84,7 @@ pub(crate) fn legacy_encrypted_range_seek_enabled() -> bool {
 }
 
 mod body_cache_hook;
+mod encryption;
 mod hook_slot;
 mod object_mutation_hook;
 mod readers;
@@ -98,6 +99,10 @@ pub use body_cache_hook::{
 pub(crate) use body_cache_hook::{
     get_object_body_cache_hook, get_object_body_cache_hook_suppressed, without_get_object_body_cache_hook,
 };
+pub use encryption::{
+    EncryptionResolutionError, EncryptionResolutionErrorKind, ObjectEncryptionResolver, ReadEncryptionMaterial,
+    ReadEncryptionMode, ReadEncryptionRequest,
+};
 pub(crate) use object_mutation_hook::notify_object_mutation;
 pub use object_mutation_hook::{ObjectMutationHook, register_object_mutation_hook, unregister_object_mutation_hook};
 pub use readers::*;