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/nonce_cache/src/main.rs

@@ -148,7 +148,7 @@ async fn pumpfun_copy_trade_with_grpc(trade_info: PumpFunTradeEvent) -> AnyResul
             trade_info.real_sol_reserves,
             None,
         )),
-        lookup_table_key: None,
+        address_lookup_table_account: None,
         wait_transaction_confirmed: true,
         create_input_token_ata: false,
         close_input_token_ata: false,