feat(sdk-coin-oas): add oas sdk skeleton

Ticket: WIN-3696

Author: adarsh312

modules/statics/src/networks.ts

@@ -1068,8 +1068,8 @@ class Oas extends Mainnet implements EthereumNetwork {
 class OasTestnet extends Testnet implements EthereumNetwork {
   name = 'OaschainTestnet';
   family = CoinFamily.OAS;
-  explorerUrl = 'https://scan.sandverse.oasys.games/tx/';
-  accountExplorerUrl = 'https://scan.sandverse.oasys.games/address/';
+  explorerUrl = 'https://explorer.testnet.oasys.games/tx/';
+  accountExplorerUrl = 'https://explorer.testnet.oasys.games/address/';
   chainId = 9372;
   nativeCoinOperationHashPrefix = '9372';
 }