refactor: remove bs58 dependency and use solana_sdk program ID constants

- Remove standalone bs58 dependency and rely on the solana_sdk re-export
- Switch system and token program IDs to the idiomatic spl_token / solana_sdk constants
- Use pubkey! and LazyLock for cleaner program ID initialization
- Alias solana_entry::Entry as SolanaEntry to avoid a naming conflict with gRPC types
- Remove unused FromStr imports and some redundant logic

src/streaming/event_parser/core/event_parser.rs

@@ -85,7 +85,7 @@ impl EventParser {
                 let recent_blockhash = if message.recent_blockhash.is_empty() {
                     None
                 } else {
-                    Some(bs58::encode(&message.recent_blockhash).into_string())
+                    Some(solana_sdk::bs58::encode(&message.recent_blockhash).into_string())
                 };
                 Self::parse_instruction_events_from_grpc_transaction(
                     protocols,