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

appauth/src/token.rs

@@ -1,8 +1,8 @@
 use rsa::Pkcs1v15Encrypt;
 use rsa::{
+    RsaPrivateKey, RsaPublicKey,
     pkcs8::{DecodePrivateKey, DecodePublicKey},
     rand_core::OsRng,
-    RsaPrivateKey, RsaPublicKey,
 };
 use serde::{Deserialize, Serialize};
 use std::io::{Error, Result};
@@ -58,8 +58,8 @@ static TEST_PRIVATE_KEY: &str = "-----BEGIN PRIVATE KEY-----\nMIIEvAIBADANBgkqhk
 mod tests {
     use super::*;
     use rsa::{
-        pkcs8::{EncodePrivateKey, EncodePublicKey, LineEnding},
         RsaPrivateKey,
+        pkcs8::{EncodePrivateKey, EncodePublicKey, LineEnding},
     };
     use std::time::{SystemTime, UNIX_EPOCH};
     #[test]