CW-1175-Implement-swaps.xyz-swap-provider (#2526)

* Integrate SwapsXYZ

* Remove print

* enhance SwapsXyz EVM token swap handling

* Disable fixed rate support in SwapsXyz provider

* enable fixed rate swap

* fix timestamp parsing

* remove sender and recipient address from fetchRate

* Improve SwapsXYZ trade approval logic

* fix trade ID overflow

* add Base chain support for  swaps xyz

* Update lib/view_model/exchange/exchange_trade_view_model.dart

Co-authored-by: Omar Hatem <omarh.ismail1@gmail.com>

* add missing support for Base

---------

Co-authored-by: Omar Hatem <omarh.ismail1@gmail.com>

lib/base/cw_base.dart

@@ -189,6 +189,10 @@ class CWBase extends Base {
   @override
   String getTokenAddress(CryptoCurrency asset) => (asset as Erc20Token).contractAddress;
 
+  @override
+  Future<bool> isApprovalRequired(WalletBase wallet, String tokenContract,String spender, BigInt requiredAmount) =>
+      (wallet as EVMChainWallet).isApprovalRequired(tokenContract, spender, requiredAmount);
+
   @override
   Future<PendingTransaction> createTokenApproval(
     WalletBase wallet,
@@ -205,6 +209,12 @@ class CWBase extends Base {
         "BASE",
       );
 
+  @override
+  Future<PendingTransaction> createRawCallDataTransaction(WalletBase wallet, String to, String dataHex, BigInt valueWei,
+      TransactionPriority priority) =>
+      (wallet as EVMChainWallet).createCallDataTransaction(to, dataHex, valueWei, priority as EVMChainTransactionPriority);
+
+
   @override
   void setHardwareWalletService(WalletBase wallet, HardwareWalletService service) {
     if (service is EVMChainLedgerService) {