feat: migrate to reed-solomon-simd only implementation

- Remove reed-solomon-erasure dependency and all related code
- Simplify ReedSolomonEncoder from enum to struct with SIMD-only implementation
- Eliminate all conditional compilation (#[cfg(feature = ...)])
- Add instance caching with RwLock-based encoder/decoder reuse
- Implement reset mechanism to avoid unnecessary allocations
- Ensure thread safety with proper cache management
- Update documentation and benchmark scripts for SIMD-only approach
- Apply code formatting across all files

Breaking Changes:
- Removes support for reed-solomon-erasure feature flag
- API remains compatible but implementation is now SIMD-only

Performance Impact:
- Improved encoding/decoding performance through SIMD optimization
- Reduced memory allocations via instance caching
- Enhanced thread safety and concurrency support

ecstore/Cargo.toml

@@ -11,9 +11,7 @@ rust-version.workspace = true
 workspace = true
 
 [features]
-default = ["reed-solomon-simd"]
-reed-solomon-simd = []
-reed-solomon-erasure = []
+default = []
 
 [dependencies]
 rustfs-config = { workspace = true, features = ["constants"] }
@@ -40,7 +38,6 @@ http.workspace = true
 highway = { workspace = true }
 url.workspace = true
 uuid = { workspace = true, features = ["v4", "fast-rng", "serde"] }
-reed-solomon-erasure = { version = "6.0.0", features = ["simd-accel"] }
 reed-solomon-simd = { version = "3.0.0" }
 transform-stream = "0.3.1"
 lazy_static.workspace = true