Scanner (#156)

* feat: integrate CancellationToken for unified background services management

- Consolidate data scanner and auto heal cancellation tokens into single unified token
- Move GLOBAL_BACKGROUND_SERVICES_CANCEL_TOKEN to global.rs for centralized management
- Add graceful shutdown support to MRF heal routine with MinIO-compatible logic
- Implement heal_routine_with_cancel method preserving original healing logic
- Update main.rs to use unified background services shutdown mechanism
- Enhance error handling with proper ecstore Result types
- Fix clippy warnings for needless return statements
- Maintain backward compatibility while adding modern cancellation support

This change provides a cleaner architecture for background service lifecycle management
and ensures all healing services can be gracefully shut down through a single token.

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

* fix: Refact heal and scanner design

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

* refact: step 2

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

* feat: refactor scanner module and add data usage statistics

- Move scanner code to scanner/ subdirectory for better organization
- Add data usage statistics collection and persistence
- Implement histogram support for size and version distribution
- Add global cancel token management for scanner operations
- Integrate scanner with ECStore for comprehensive data analysis
- Update error handling and improve test isolation
- Add data usage API endpoints and backend integration

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

* Chore: fix ref and fix comment

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

* fix: fix clippy

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

---------

Signed-off-by: junxiang Mu <1948535941@qq.com>
Co-authored-by: dandan <dandan@dandandeMac-Studio.local>

rustfs/Cargo.toml

@@ -34,6 +34,7 @@ path = "src/main.rs"
 workspace = true
 
 [dependencies]
+rustfs-ahm = { workspace = true }
 rustfs-zip = { workspace = true }
 rustfs-madmin = { workspace = true }
 rustfs-s3select-api = { workspace = true }