feat(sdk-coin-arbeth): support message signing for walletconnect

Ticket: SC-3506

Author: derekchen745

modules/sdk-coin-arbeth/src/arbeth.ts

@@ -32,6 +32,16 @@ export class Arbeth extends AbstractEthLikeNewCoins {
     return 'ecdsa';
   }
 
+  /** @inheritDoc */
+  supportsMessageSigning(): boolean {
+    return true;
+  }
+
+  /** @inheritDoc */
+  supportsSigningTypedData(): boolean {
+    return true;
+  }
+
   /**
    * Make a query to Arbiscan for information such as balance, token balance, solidity calls
    * @param {Object} query key-value pairs of parameters to append after /api