refactor: Replace global address lookup table cache with direct fetch approach

Replace the global AddressLookupTableCache with a direct fetch function to simplify address lookup table management. This change improves code maintainability by removing global state and makes the API more explicit.

Key changes:
- Remove AddressLookupTableCache and AddressLookupManager
- Add new fetch_address_lookup_table_account function
- Update TradeBuyParams and TradeSellParams to use AddressLookupTableAccount instead of Pubkey
- Update all examples to use the new direct fetch approach
- Update documentation to reflect the simplified workflow

examples/middleware_system/src/main.rs

@@ -92,7 +92,7 @@ async fn test_middleware() -> AnyResult<()> {
         extension_params: Box::new(
             PumpSwapParams::from_pool_address_by_rpc(&client.rpc, &pool_address).await?,
         ),
-        lookup_table_key: None,
+        address_lookup_table_account: None,
         wait_transaction_confirmed: true,
         create_input_token_ata: true,
         close_input_token_ata: true,