feat: upgrade to v2.0.0 with major dependency updates

- Upgrade Solana dependencies from 2.3.x to 3.0.0 series
  - Upgrade solana-streamer-sdk from 0.4.13 to 0.5.0
  - Upgrade yellowstone-grpc from 8.0.0 to 9.0.0
  - Add new SPL token utility modules (spl_token.rs, spl_token_2022.rs,
  spl_associated_token_account.rs)
  - Remove deprecated gRPC protocol definitions (protos/ directory)
  - Remove event_subscription example and update all example dependencies
  - Update README documentation to reflect v2.0.0 changes
  - Refactor imports to use new dependency structure across examples

  BREAKING CHANGES:
  - Solana SDK upgraded to 3.0.0 with API changes
  - Removed gRPC protocol definitions
  - Updated import paths for SPL token operations

src/swqos/mod.rs

@@ -12,7 +12,8 @@ pub mod astralane;
 
 use std::sync::Arc;
 
-use solana_sdk::{commitment_config::CommitmentConfig, transaction::VersionedTransaction};
+use solana_commitment_config::CommitmentConfig;
+use solana_sdk::transaction::VersionedTransaction;
 use tokio::sync::RwLock;
 
 use anyhow::Result;

src/swqos/solana_rpc.rs

@@ -1,7 +1,8 @@
 use std::{sync::Arc, time::Instant};
 
 use solana_client::rpc_config::RpcSendTransactionConfig;
-use solana_sdk::{commitment_config::CommitmentLevel, transaction::VersionedTransaction};
+use solana_commitment_config::CommitmentLevel;
+use solana_sdk::transaction::VersionedTransaction;
 use solana_transaction_status::UiTransactionEncoding;
 
 use crate::swqos::SwqosClientTrait;